make sample rate configurable (#6)

add pickle support

.github/workflows/all.yml

@@ -3,6 +3,8 @@ name: Python package
 on:
   push:
     branches: [ "main" ]
+    paths-ignore:
+      - "README.md"
   pull_request:
     branches: [ "main" ]
   release:

.gitignore

@@ -39,3 +39,4 @@ dataset
 *.egg-info*
 vita/LICENSE
 dist
+headless/builds/VisualStudio2022/x64

Makefile

@@ -1,6 +1,8 @@
-PYTHONINCLUDEPATH := $(shell python3.10 -c "import sysconfig; print(sysconfig.get_path('include'))")
+PYTHON := $(shell which python)
 
-PYTHONLIBPATH := $(shell python3.10 -c "import sysconfig; print(sysconfig.get_config_var('LIBDIR'))")
+PYTHONINCLUDEPATH := $(shell $(PYTHON) -c "import sysconfig; print(sysconfig.get_path('include'))")
+
+PYTHONLIBPATH := $(shell $(PYTHON) -c "import sysconfig; print(sysconfig.get_config_var('LIBDIR'))")
 
 ifndef CONFIG
 	CONFIG=Release
@@ -8,7 +10,7 @@ endif
 
 ifndef LIBDIR
 	# LIBDIR=/usr/lib/
-	LIBDIR=$(shell python3.10 -c "import sysconfig; print(sysconfig.get_config_var('LIBDIR'))")
+	LIBDIR=$(shell $(PYTHON) -c "import sysconfig; print(sysconfig.get_config_var('LIBDIR'))")
 endif
 
 BUILD_DATE="$(shell date +'%Y %m %d %H %M')"

README.md

@@ -1,6 +1,6 @@
 # Vita
 
-Vita is a Python module for interacting with the [Vital Synthesizer](https://github.com/mtytel/vital). **It is not an official product related to Vital**.
+Vita is a Python module for interacting with the [Vital Synthesizer](https://github.com/mtytel/vital). **It is not an official product related to Vital**. Vita uses [Effort-based versioning](https://jacobtomlinson.dev/effver/).
 
 ## Installation
 
@@ -16,8 +16,7 @@ pip install vita
 from scipy.io import wavfile
 import vita
 
-SAMPLE_RATE = 44_100
+sample_rate = 44100
-
 bpm = 120.0
 note_dur = 1.0
 render_dur = 3.0
@@ -27,6 +26,7 @@ velocity = 0.7  # [0.0 to 1.0]
 synth = vita.Synth()
 # The initial preset is loaded by default.
 
+synth.set_sample_rate(sample_rate)
 synth.set_bpm(bpm)
 
 # Let's make a custom modulation using
@@ -35,30 +35,43 @@ synth.set_bpm(bpm)
 print("potential sources:", vita.get_modulation_sources())
 print("potential destinations:", vita.get_modulation_destinations())
 
-# "lfo_1" and "filter_1_cutoff" are potential sources and destinations.
+# "lfo_1" is a potential source,
+# and "filter_1_cutoff" is a potential destination.
 assert synth.connect_modulation("lfo_1", "filter_1_cutoff")
 
 controls = synth.get_controls()
 controls["modulation_1_amount"].set(1.0)
 controls["filter_1_on"].set(1.0)
+val = controls["filter_1_on"].value()
 controls["lfo_1_tempo"].set(vita.constants.SyncedFrequency.k1_16)
 
+# Use normalized parameter control (0-1 range, VST-style)
+controls["filter_1_cutoff"].set_normalized(0.5)  # Set knob to 50%
+print(controls["filter_1_cutoff"].get_normalized())  # Get normalized value
+
+# Get parameter details and display text
+info = synth.get_control_details("delay_style")
+print(f"Options: {info.options}")  # ["Mono", "Stereo", "Ping Pong", "Mid Ping Pong"]
+print(f"Current: {synth.get_control_text('delay_style')}")  # e.g., "Stereo"
+
 # Render audio to numpy array shaped (2, NUM_SAMPLES)
 audio = synth.render(pitch, velocity, note_dur, render_dur)
 
-wavfile.write("generated_preset.wav", SAMPLE_RATE, audio.T)
+wavfile.write("generated_preset.wav", sample_rate, audio.T)
 
 # Dump current state to JSON text
 preset_path = "generated_preset.vital"
 
 json_text = synth.to_json()
+
 with open(preset_path, "w") as f:    
     f.write(json_text)
 
 # Load JSON text
 with open(preset_path, "r") as f:
     json_text = f.read()
-    assert synth.load_json(json_text)
+
+assert synth.load_json(json_text)
 
 # Or load directly from file
 assert synth.load_preset(preset_path)
@@ -69,6 +82,8 @@ synth.load_init_preset()
 synth.clear_modulations()
 ```
 
+Documentation is not yet automated. Please browse [bindings.cpp](https://github.com/DBraun/Vita/blob/main/src/headless/bindings.cpp) to get a sense of how the code works.
+
 ### Issues
 
 If you find any issues with the code, report them at https://github.com/DBraun/Vita.

build_linux.sh

@@ -1,3 +1,7 @@
+# export LIBDIR=/usr/lib/python3.10
+# export PYTHONLIBPATH=/usr/lib/python3.10
+# export PYTHONINCLUDEPATH=/usr/include/python3.10
+
 echo "PYTHONLIBPATH: $PYTHONLIBPATH"
 echo "PYTHONINCLUDEPATH: $PYTHONINCLUDEPATH"
 echo "LIBDIR: $LIBDIR"
@@ -16,3 +20,6 @@ cd ../..
 make headless_server
 
 echo "build_linux.sh is done!"
+
+# to build a wheel:
+# python3 -m build --wheel

examples/multiprocessing_presets/.gitignore

@@ -0,0 +1 @@
+output

examples/multiprocessing_presets/README.md

@@ -0,0 +1,14 @@
+# Vita - Multiprocessing
+
+This script demonstrates how to use [multiprocessing](https://docs.python.org/3/library/multiprocessing.html) to efficiently generate one-shots. The number of workers is by default `multiprocessing.cpu_count()`. Each worker has a persistent synthesizer instance. Each worker consumes paths of presets from a multiprocessing [Queue](https://docs.python.org/3/library/multiprocessing.html#pipes-and-queues). For each preset, the worker renders out audio for a configurable MIDI pitch range. The output audio path includes the pitch and preset name.
+
+Example usage:
+
+```bash
+python main.py --preset-dir "path/to/vital_presets"
+```
+
+To see all available parameters:
+```bash
+python main.py --help
+```

examples/multiprocessing_presets/main.py

@@ -0,0 +1,183 @@
+# This file is part of the Vita distribution (https://github.com/DBraun/Vita).
+# Copyright (c) 2025 David Braun.
+
+import argparse
+from collections import namedtuple
+import logging
+import multiprocessing
+import os
+from pathlib import Path
+import time
+import traceback
+
+# extra libraries to install with pip
+import vita
+import numpy as np
+from scipy.io import wavfile
+from tqdm import tqdm
+
+
+Item = namedtuple("Item", "preset_path")
+
+
+class Worker:
+
+    def __init__(
+        self,
+        queue: multiprocessing.Queue,
+        bpm: float = 120.0,
+        note_duration: float = 2.0,
+        render_duration: float = 5.0,
+        pitch_low: int = 60,
+        pitch_high: int = 72,
+        velocity: int = 100,
+        output_dir="output",
+    ):
+        self.queue = queue
+        self.bpm = bpm
+        self.note_duration = note_duration
+        self.render_duration = render_duration
+        self.pitch_low, self.pitch_high = pitch_low, pitch_high
+        self.velocity = velocity
+        self.output_dir = Path(output_dir)
+
+    def startup(self):
+        synth = vita.Synth()
+        synth.set_bpm(self.bpm)
+        self.synth = synth
+
+    def process_item(self, item: Item):
+        preset_path = item.preset_path
+        self.synth.load_preset(preset_path)
+        basename = os.path.basename(preset_path)
+
+        for pitch in range(self.pitch_low, self.pitch_high + 1):
+            audio = self.synth.render(
+                pitch, self.velocity, self.note_duration, self.note_duration
+            )
+            output_path = self.output_dir / f"{pitch}_{basename}.wav"
+            wavfile.write(str(output_path), 44_100, audio.transpose())
+
+    def run(self):
+        try:
+            self.startup()
+            while True:
+                try:
+                    item = self.queue.get_nowait()
+                    self.process_item(item)
+                except multiprocessing.queues.Empty:
+                    break
+        except Exception as e:
+            return traceback.format_exc()
+
+
+def main(
+    preset_dir,
+    bpm: float = 120.0,
+    note_duration: float = 2.0,
+    render_duration: float = 4.0,
+    pitch_low: int = 60,
+    pitch_high: int = 60,
+    num_workers=None,
+    output_dir="output",
+    logging_level="INFO",
+):
+
+    # Create logger
+    logging.basicConfig()
+    logger = logging.getLogger("vita")
+    logger.setLevel(logging_level.upper())
+
+    # Glob all the preset file paths
+    preset_paths = list(Path(preset_dir).rglob("*.vital"))
+
+    # Get num items so that the progress bar works well
+    num_items = len(preset_paths)
+
+    # Create a Queue and add items
+    input_queue = multiprocessing.Manager().Queue()
+    for preset_path in preset_paths:
+        input_queue.put(Item(str(preset_path)))
+
+    # Create a list to hold the worker processes
+    workers = []
+
+    # The number of workers to spawn
+    num_processes = num_workers or multiprocessing.cpu_count()
+
+    # Log info
+    logger.info(f"Note duration: {note_duration}")
+    logger.info(f"Render duration: {render_duration}")
+    logger.info(f"Using num workers: {num_processes}")
+    logger.info(f"Pitch low: {pitch_low}")
+    logger.info(f"Pitch high: {pitch_high}")
+    logger.info(f"Output directory: {output_dir}")
+
+    os.makedirs(output_dir, exist_ok=True)
+
+    # Create a multiprocessing Pool
+    with multiprocessing.Pool(processes=num_processes) as pool:
+        # Create and start a worker process for each CPU
+        for i in range(num_processes):
+            worker = Worker(
+                input_queue,
+                bpm=bpm,
+                note_duration=note_duration,
+                render_duration=render_duration,
+                pitch_low=pitch_low,
+                pitch_high=pitch_high,
+                output_dir=output_dir,
+            )
+            async_result = pool.apply_async(worker.run)
+            workers.append(async_result)
+
+        # Use tqdm to track progress. Update the progress bar in each iteration.
+        pbar = tqdm(total=num_items)
+        while True:
+            incomplete_count = sum(1 for w in workers if not w.ready())
+            pbar.update(
+                num_items - input_queue.qsize() - pbar.n
+            )  # not perfectly accurate.
+            if incomplete_count == 0:
+                break
+            time.sleep(0.1)
+        pbar.close()
+
+    # Check for exceptions in the worker processes
+    for i, worker in enumerate(workers):
+        exception = worker.get()
+        if exception is not None:
+            logger.error(f"Exception in worker {i}:\n{exception}")
+
+    logger.info("All done!")
+
+
+if __name__ == "__main__":
+    # We're using multiprocessing.Pool, so our code MUST be inside __main__.
+    # See https://docs.python.org/3/library/multiprocessing.html
+
+    # fmt: off
+    parser = argparse.ArgumentParser()
+    parser.add_argument("--preset-dir", required=True, help="Directory path of Vital presets.")
+    parser.add_argument("--bpm", default=120.0, type=float, help="Beats per minute for the Render Engine.")
+    parser.add_argument("--note-duration", default=1, type=float, help="Note duration in seconds.")
+    parser.add_argument("--pitch-low", default=60, type=int, help="Lowest MIDI pitch to be used (inclusive).")
+    parser.add_argument("--pitch-high", default=60, type=int, help="Highest MIDI pitch to be used (inclusive).")
+    parser.add_argument("--render-duration", default=1, type=float, help="Render duration in seconds.")
+    parser.add_argument("--num-workers", default=None, type=int, help="Number of workers to use.")
+    parser.add_argument("--output-dir", default=os.path.join(os.path.dirname(__file__), "output"), help="Output directory.")
+    parser.add_argument("--log-level", default="INFO", choices=["DEBUG", "INFO", "WARNING", "ERROR", "CRITICAL", "NOTSET"], help="Logger level.")
+    # fmt: on
+    args = parser.parse_args()
+
+    main(
+        args.preset_dir,
+        args.bpm,
+        args.note_duration,
+        args.render_duration,
+        args.pitch_low,
+        args.pitch_high,
+        args.num_workers,
+        args.output_dir,
+        args.log_level,
+    )

examples/normalized_control_demo.py

@@ -0,0 +1,93 @@
+"""
+Demo: VST-style normalized parameter control
+
+This example shows how to control Vital synthesizer parameters using
+normalized 0-1 values, similar to how VST/AU plugins work in DAWs.
+"""
+
+import vita
+from scipy.io import wavfile
+
+SAMPLE_RATE = 44_100
+
+def main():
+    synth = vita.Synth()
+    synth.set_bpm(120.0)
+
+    # Direct control - linear interpolation of actual values
+    controls = synth.get_controls()
+    # Turn the filter on
+    controls["filter_1_on"].set(1.0)
+    
+    # Example 1: Comparing direct vs normalized control (Filter 1 Cutoff)
+    print("=== Comparing Direct vs Normalized Control ===")
+    
+    # Get info about the filter 1 cutoff parameter
+    info = synth.get_control_details("filter_1_cutoff")
+    print(f"Parameter: {info.display_name}")
+    print(f"Range: {info.min} to {info.max}")
+    print(f"Scale: {str(info.scale)}")
+    print()
+    
+    print("Direct control (linear interpolation):")
+    for pct in [0.0, 0.25, 0.5, 0.75, 1.0]:
+        value = info.min + pct * (info.max - info.min)
+        controls["filter_1_cutoff"].set(value)
+        print(f"  {pct*100:3.0f}% → value={value:.3f}")
+    
+    print("\nNormalized control (VST-style):")
+    for norm in [0.0, 0.25, 0.5, 0.75, 1.0]:
+        controls["filter_1_cutoff"].set_normalized(norm)
+        actual = controls["filter_1_cutoff"].value()
+        display_text = synth.get_control_text("filter_1_cutoff")
+        print(f"  {norm*100:3.0f}% → value={actual:.3f} (displays as {display_text})")
+        # Render a short note
+        audio = synth.render(36, 0.8, 0.9, 1)  # C2, velocity 0.8, 0.9s note, 1.0s render
+        
+        filename = f"filter_sweep_{int(norm*100):03d}.wav"
+        wavfile.write(filename, SAMPLE_RATE, audio.T)
+        print(f"Rendered {filename} with filter at {norm*100:.0f}%")
+
+
+    # Example 2: Comparing direct vs normalized control (Env 1 Delay)
+    print("\n=== Comparing Direct vs Normalized Control ===")
+    
+    # Get info about the Env 1 Delay parameter
+    info = synth.get_control_details("env_1_delay")
+    print(f"Parameter: {info.display_name}")
+    print(f"Range: {info.min} to {info.max}")
+    print(f"Scale: {str(info.scale)}")
+    print()
+    
+    print("Direct control (linear interpolation):")
+    for pct in [0.0, 0.25, 0.5, 0.75, 1.0]:
+        value = info.min + pct * (info.max - info.min)
+        controls["env_1_delay"].set(value)
+        print(f"  {pct*100:3.0f}% → value={value:.3f}")
+    
+    print("\nNormalized control (VST-style):")
+    print("(Note: knob position has quartic relationship to display value)")
+    for norm in [0.0, 0.25, 0.5, 0.75, 1.0]:
+        controls["env_1_delay"].set_normalized(norm)
+        actual = controls["env_1_delay"].value()
+        display_text = synth.get_control_text("env_1_delay")
+        expected_display = 4.0 * (norm ** 4)
+        print(f"  {norm*100:3.0f}% → value={actual:.3f} (displays as {display_text}, expected ~{expected_display:.2f}s)")
+        
+    # Example 3: Discrete parameter control (Delay Style)
+    print("\n=== Discrete Parameter Control ===")
+    
+    info = synth.get_control_details("delay_style")
+    print(f"Delay styles: {info.options}")
+    
+    # Cycle through delay styles using normalized values
+    num_styles = len(info.options)
+    for i in range(num_styles):
+        normalized = i / (num_styles - 1) if num_styles > 1 else 0
+        controls["delay_style"].set_normalized(normalized)
+        style = controls["delay_style"].get_text()
+        print(f"Normalized {normalized:.2f} → {style}")
+
+
+if __name__ == "__main__":
+    main()

headless/builds/VisualStudio2022/Vita_DynamicLibrary.vcxproj.user

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="Current" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup />
+</Project>

setup.py

@@ -5,7 +5,7 @@
 # Then in the `dist` directory, `pip install vita`
 
 import setuptools
-from setuptools import setup, Extension
+from setuptools import setup
 from setuptools.dist import Distribution
 import os
 import os.path

src/common/synth_base.cpp

@@ -16,6 +16,7 @@
 
 #include "synth_base.h"
 
+#include <nanobind/nanobind.h>
 #include "sample_source.h"
 #include "sound_engine.h"
 #include "load_save.h"
@@ -432,11 +433,12 @@ bool SynthBase::loadFromString(std::string json_text) {
 
   //setPresetName(preset.getFileNameWithoutExtension()); // todo:
 
-  SynthGuiInterface* gui_interface = getGuiInterface();
+  // note: dbraun commented this out since we're running headless anyway.
-  if (gui_interface) {
+  //SynthGuiInterface* gui_interface = getGuiInterface();
-    gui_interface->updateFullGui();
+  //if (gui_interface) {
-    gui_interface->notifyFresh();
+  //  gui_interface->updateFullGui();
-  }
+  //  gui_interface->notifyFresh();
+  //}
 
   return true;
 }
@@ -446,8 +448,13 @@ void SynthBase::pySetBPM(float bpm) {
     engine_->setBpm(bpm);
 };
 
+// src/plugin/synth_plugin.cpp Line 129-133 prepareToPlay
+void SynthBase::setSampleRate(double sample_rate) {
+  engine_->setSampleRate(sample_rate);
+  midi_manager_->setSampleRate(sample_rate);
+}
+
 void SynthBase::renderAudioToFile(File file, std::vector<int> notes, float velocity, float note_dur, float render_dur, bool render_images) {
-  static constexpr int kSampleRate = 44100;
   static constexpr int kPreProcessSamples = 44100;
   static constexpr int kFadeSamples = 200;
   static constexpr int kBufferSize = 64;
@@ -462,11 +469,11 @@ void SynthBase::renderAudioToFile(File file, std::vector<int> notes, float veloc
   engine_->allSoundsOff(); // note: dbraun added this
 
   processModulationChanges();
-  engine_->setSampleRate(kSampleRate);
 //  engine_->setBpm(bpm);
   engine_->updateAllModulationSwitches();
+  int kSampleRate = getSampleRate();
 
-  double sample_time = 1.0 / getSampleRate();
+  double sample_time = 1.0 / kSampleRate;
   double current_time = -kPreProcessSamples * sample_time;
 
   for (int samples = 0; samples < kPreProcessSamples; samples += kBufferSize) {
@@ -573,21 +580,23 @@ void SynthBase::renderAudioToFile(File file, std::vector<int> notes, float veloc
 }
 
 nb::ndarray<float, nb::shape<2, -1>, nb::numpy> SynthBase::renderAudioToNumpy(const int& midi_note, float velocity, float note_dur, float render_dur) {
-  static constexpr int kSampleRate = 44100;
   static constexpr int kFadeSamples = 200;
   static constexpr int kBufferSize = 64;
   static constexpr int kPreProcessSamples = 256; // note: dbraun decreased this from 44100.
 
+  // Release GIL for the performance-critical section
+  // nb::gil_scoped_release gil_release;  // TODO:
+  
   ScopedLock lock(getCriticalSection());
 
   engine_->allSoundsOff();  // note: dbraun added this
 
   processModulationChanges();
-  engine_->setSampleRate(kSampleRate);
   engine_->updateAllModulationSwitches();
+  int kSampleRate = getSampleRate();
 
   // Preprocess modulation
-  double sample_time = 1.0 / getSampleRate();
+  double sample_time = 1.0 / kSampleRate;
   double current_time = -kPreProcessSamples * sample_time;
 
   for (int samples = 0; samples < kPreProcessSamples; samples += kBufferSize) {
@@ -607,8 +616,6 @@ nb::ndarray<float, nb::shape<2, -1>, nb::numpy> SynthBase::renderAudioToNumpy(co
       static_cast<size_t>(total_samples * 2);  // stereo: 2 channels
 
   auto* data = new float[total_frames]();  // Zero-initialized
-  auto capsule = nb::capsule(
-      data, [](void* p) noexcept { delete[] static_cast<float*>(p); });
 
   int baseSample = 0;
 
@@ -634,9 +641,15 @@ nb::ndarray<float, nb::shape<2, -1>, nb::numpy> SynthBase::renderAudioToNumpy(co
     }
   }
 
+  // Re-acquire GIL before creating numpy array
+  // nb::gil_scoped_acquire gil_acquire;  // TODO:
+  
+  // Create capsule with the data
+  nb::capsule owner(data, [](void* p) noexcept { delete[] (float*)p; });
+
   // Return the data as a NumPy array
   return nb::ndarray<float, nb::shape<2, -1>, nb::numpy>(
-      data, {2, static_cast<size_t>(total_samples)}, capsule);
+      data, {2, static_cast<size_t>(total_samples)}, owner);
 }
 
 bool SynthBase::renderAudioToFile2(const std::string& output_path, const int& midi_note, float velocity, float note_dur, float render_dur) {

src/common/synth_base.h

@@ -139,6 +139,7 @@ class SynthBase : public MidiManager::Listener {
     Tuning* getTuning() { return &tuning_; }
     
     void pySetBPM(float bpm);
+    void setSampleRate(double sample_rate);
 
     struct ValueChangedCallback : public CallbackMessage {
       ValueChangedCallback(std::shared_ptr<SynthBase*> listener, std::string name, vital::mono_float val) :

src/headless/bindings.cpp

@@ -18,6 +18,10 @@
 #include "value.h"
 #include "voice_handler.h"
 #include "wave_frame.h"
+#include <stdexcept>
+#include "synth_parameters.h"
+#include <cmath>
+#include <string>
 
 namespace nb = nanobind;
 using namespace vital;
@@ -100,6 +104,165 @@ nb::list get_modulation_sources() {
   return result;
 }
 
+// Get formatted display text for a control (with scaling & units).
+static std::string get_control_text(HeadlessSynth &synth, const std::string &name) {
+    auto &controls = synth.getControls();
+    auto it = controls.find(name);
+    if (it == controls.end())
+        throw std::runtime_error("No control: " + name);
+    mono_float raw = it->second->value();
+    const auto &details = Parameters::getDetails(name);
+    // Discrete/indexed parameters
+    if (details.string_lookup) {
+        int count = static_cast<int>(details.max - details.min + 1);
+        int idx = static_cast<int>(std::lround(raw - details.min));
+        if (idx < 0) idx = 0;
+        else if (idx >= count) idx = count - 1;
+        return details.string_lookup[idx];
+    }
+    // Continuous parameters: apply scaling
+    float skewed;
+    switch (details.value_scale) {
+    case ValueDetails::kQuadratic: skewed = raw * raw; break;
+    case ValueDetails::kCubic: skewed = raw * raw * raw; break;
+    case ValueDetails::kQuartic: skewed = raw * raw; skewed = skewed * skewed; break;
+    case ValueDetails::kExponential:
+        if (details.display_invert)
+            skewed = 1.0f / std::pow(2.0f, raw);
+        else
+            skewed = std::pow(2.0f, raw);
+        break;
+    case ValueDetails::kSquareRoot: skewed = std::sqrt(raw); break;
+    default: skewed = raw; break;
+    }
+    float display_val = details.display_multiply * skewed + details.post_offset;
+    return std::to_string(display_val) + details.display_units;
+}
+
+// Wrapper class for Value that knows its parameter name
+class ControlValue {
+private:
+    vital::Value* value_;
+    std::string name_;
+    HeadlessSynth* synth_;
+
+public:
+    ControlValue(vital::Value* value, const std::string& name, HeadlessSynth* synth)
+        : value_(value), name_(name), synth_(synth) {}
+
+    // Delegate existing Value methods
+    float value() const { return value_->value(); }
+    void set(double v) { value_->set(poly_float(static_cast<float>(v))); }
+    void set(int v) { value_->set(poly_float(static_cast<float>(v))); }
+    
+    // Normalized control methods
+    void set_normalized(double normalized) {
+        // Clamp to 0-1
+        normalized = std::max(0.0, std::min(1.0, normalized));
+        
+        const auto &details = Parameters::getDetails(name_);
+        float value;
+        
+        if (details.value_scale == ValueDetails::kIndexed) {
+            // For indexed parameters, quantize to discrete values
+            int num_options = static_cast<int>(details.max - details.min + 1);
+            int index = static_cast<int>(std::round(normalized * (num_options - 1)));
+            value = details.min + index;
+        } else {
+            // For non-linear parameters, normalized represents the display position
+            // We need to convert: normalized -> display value -> internal value
+            float value_normalized = static_cast<float>(normalized);
+            
+            switch (details.value_scale) {
+            case ValueDetails::kQuadratic:
+                // Display = internal^2, so internal = sqrt(display)
+                // normalized maps to display range
+                value = details.min + std::sqrt(value_normalized) * (details.max - details.min);
+                break;
+            case ValueDetails::kCubic:
+                // Display = internal^3, so internal = display^(1/3)
+                value = details.min + std::pow(value_normalized, 1.0f/3.0f) * (details.max - details.min);
+                break;
+            case ValueDetails::kQuartic: {
+                // VST behavior: knob position represents quartic of display position
+                // When knob is at 50%, we want display = 4 * 0.5^4 = 0.25 seconds
+                // Since display = internal^4 and max_display = max_internal^4
+                // We want internal = (normalized^4 * max_display)^(1/4) = normalized * max_internal
+                value = details.min + value_normalized * (details.max - details.min);
+                break;
+            }
+            case ValueDetails::kExponential:
+                // For exponential, normalized maps directly to the exponent
+                if (details.display_invert)
+                    value = details.min + (1.0f / std::pow(2.0f, value_normalized)) * (details.max - details.min);
+                else
+                    value = details.min + std::pow(2.0f, value_normalized) * (details.max - details.min);
+                break;
+            case ValueDetails::kSquareRoot:
+                // Display = sqrt(internal), so internal = display^2
+                value = details.min + (value_normalized * value_normalized) * (details.max - details.min);
+                break;
+            default: // Linear
+                value = details.min + value_normalized * (details.max - details.min);
+                break;
+            }
+        }
+        
+        value_->set(value);
+    }
+    
+    double get_normalized() const {
+        const auto &details = Parameters::getDetails(name_);
+        float raw = value_->value();
+        
+        if (details.value_scale == ValueDetails::kIndexed) {
+            // For indexed parameters, normalize based on index
+            int num_options = static_cast<int>(details.max - details.min + 1);
+            int index = static_cast<int>(std::round(raw - details.min));
+            return static_cast<double>(index) / (num_options - 1);
+        } else {
+            // Normalize to 0-1 range within parameter bounds
+            float normalized_internal = (raw - details.min) / (details.max - details.min);
+            float normalized;
+            
+            // Convert internal value to display position (0-1)
+            switch (details.value_scale) {
+            case ValueDetails::kQuadratic:
+                // Display = internal^2
+                normalized = normalized_internal * normalized_internal;
+                break;
+            case ValueDetails::kCubic:
+                // Display = internal^3
+                normalized = normalized_internal * normalized_internal * normalized_internal;
+                break;
+            case ValueDetails::kQuartic:
+                // VST behavior: normalized position = internal position
+                normalized = normalized_internal;
+                break;
+            case ValueDetails::kExponential:
+                // For exponential, need to account for the range
+                if (details.display_invert)
+                    normalized = -std::log2(normalized_internal + 1e-10f);
+                else
+                    normalized = std::log2(normalized_internal + 1e-10f);
+                break;
+            case ValueDetails::kSquareRoot:
+                // Display = sqrt(internal)
+                normalized = std::sqrt(normalized_internal);
+                break;
+            default: // Linear
+                normalized = normalized_internal;
+                break;
+            }
+            
+            return std::max(0.0, std::min(1.0, static_cast<double>(normalized)));
+        }
+    }
+    
+    std::string get_text() const {
+        return get_control_text(*synth_, name_);
+    }
+};
 
 NB_MODULE(vita, m) {
 
@@ -112,17 +275,14 @@ NB_MODULE(vita, m) {
     auto m_constants = m.def_submodule("constants", "Submodule containing constants and enums");
     
     // Expose Enums
-    nb::enum_<constants::SourceDestination>(m_constants, "SourceDestination")
+    nb::enum_<constants::SourceDestination>(m_constants, "SourceDestination", nb::is_arithmetic())
         .value("Filter1", constants::SourceDestination::kFilter1)
         .value("Filter2", constants::SourceDestination::kFilter2)
         .value("DualFilters", constants::SourceDestination::kDualFilters)
         .value("Effects", constants::SourceDestination::kEffects)
-        .value("DirectOut", constants::SourceDestination::kDirectOut)
+        .value("DirectOut", constants::SourceDestination::kDirectOut);
-        .def("__int__", [](constants::SourceDestination self) {
-          return static_cast<int>(self);
-        });
 
-    nb::enum_<constants::Effect>(m_constants, "Effect")
+    nb::enum_<constants::Effect>(m_constants, "Effect", nb::is_arithmetic())
         .value("Chorus", constants::Effect::kChorus)
         .value("Compressor", constants::Effect::kCompressor)
         .value("Delay", constants::Effect::kDelay)
@@ -131,11 +291,9 @@ NB_MODULE(vita, m) {
         .value("FilterFx", constants::Effect::kFilterFx)
         .value("Flanger", constants::Effect::kFlanger)
         .value("Phaser", constants::Effect::kPhaser)
-        .value("Reverb", constants::Effect::kReverb)
+        .value("Reverb", constants::Effect::kReverb);
-        .def("__int__",
-             [](constants::Effect self) { return static_cast<int>(self); });
 
-    nb::enum_<constants::FilterModel>(m_constants, "FilterModel")
+    nb::enum_<constants::FilterModel>(m_constants, "FilterModel", nb::is_arithmetic())
         .value("Analog", constants::FilterModel::kAnalog)
         .value("Dirty", constants::FilterModel::kDirty)
         .value("Ladder", constants::FilterModel::kLadder)
@@ -143,20 +301,51 @@ NB_MODULE(vita, m) {
         .value("Diode", constants::FilterModel::kDiode)
         .value("Formant", constants::FilterModel::kFormant)
         .value("Comb", constants::FilterModel::kComb)
-        .value("Phase", constants::FilterModel::kPhase)
+        .value("Phase", constants::FilterModel::kPhase);
-        .def("__int__", [](constants::FilterModel self) {
-          return static_cast<int>(self);
-        });
 
-    nb::enum_<constants::RetriggerStyle>(m_constants, "RetriggerStyle")
+    nb::enum_<constants::RetriggerStyle>(m_constants, "RetriggerStyle", nb::is_arithmetic())
         .value("Free", constants::RetriggerStyle::kFree)
         .value("Retrigger", constants::RetriggerStyle::kRetrigger)
-        .value("SyncToPlayHead", constants::RetriggerStyle::kSyncToPlayHead)
+        .value("SyncToPlayHead", constants::RetriggerStyle::kSyncToPlayHead);
-        .def("__int__", [](constants::RetriggerStyle self) {
+
-          return static_cast<int>(self);
+    // Parameter value scaling types
+    nb::enum_<vital::ValueDetails::ValueScale>(m_constants, "ValueScale", nb::is_arithmetic())
+        .value("Indexed", vital::ValueDetails::kIndexed)
+        .value("Linear", vital::ValueDetails::kLinear)
+        .value("Quadratic", vital::ValueDetails::kQuadratic)
+        .value("Cubic", vital::ValueDetails::kCubic)
+        .value("Quartic", vital::ValueDetails::kQuartic)
+        .value("SquareRoot", vital::ValueDetails::kSquareRoot)
+        .value("Exponential", vital::ValueDetails::kExponential);
+
+    // ControlInfo provides metadata for each parameter
+    nb::class_<vital::ValueDetails>(m, "ControlInfo")
+        .def(nb::init<>())
+        .def_ro("name", &vital::ValueDetails::name)
+        .def_ro("min", &vital::ValueDetails::min)
+        .def_ro("max", &vital::ValueDetails::max)
+        .def_ro("default_value", &vital::ValueDetails::default_value)
+        .def_ro("version_added", &vital::ValueDetails::version_added)
+        .def_ro("post_offset", &vital::ValueDetails::post_offset)
+        .def_ro("display_multiply", &vital::ValueDetails::display_multiply)
+        .def_ro("scale", &vital::ValueDetails::value_scale)
+        .def_ro("display_units", &vital::ValueDetails::display_units)
+        .def_ro("display_name", &vital::ValueDetails::display_name)
+        .def_prop_ro("is_discrete",
+                     [](const vital::ValueDetails &d) {
+            return d.value_scale == vital::ValueDetails::kIndexed;
+        })
+        .def_prop_ro("options", [](const vital::ValueDetails &d) {
+            nb::list opts;
+            if (d.value_scale == vital::ValueDetails::kIndexed && d.string_lookup) {
+                int count = static_cast<int>(d.max - d.min + 1);
+                for (int i = 0; i < count; ++i)
+                    opts.append(std::string(d.string_lookup[i]));
+            }
+            return opts;
         });
 
-    nb::enum_<SynthOscillator::SpectralMorph>(m_constants, "SpectralMorph")
+    nb::enum_<SynthOscillator::SpectralMorph>(m_constants, "SpectralMorph", nb::is_arithmetic())
         .value("NoSpectralMorph", SynthOscillator::SpectralMorph::kNoSpectralMorph)
         .value("Vocode", SynthOscillator::SpectralMorph::kVocode)
         .value("FormScale", SynthOscillator::SpectralMorph::kFormScale)
@@ -168,12 +357,9 @@ NB_MODULE(vita, m) {
         .value("HighPass", SynthOscillator::SpectralMorph::kHighPass)
         .value("PhaseDisperse", SynthOscillator::SpectralMorph::kPhaseDisperse)
         .value("ShepardTone", SynthOscillator::SpectralMorph::kShepardTone)
-        .value("Skew", SynthOscillator::SpectralMorph::kSkew)
+        .value("Skew", SynthOscillator::SpectralMorph::kSkew);
-        .def("__int__", [](SynthOscillator::SpectralMorph self) {
-          return static_cast<int>(self);
-        });
     
-    nb::enum_<SynthOscillator::DistortionType>(m_constants, "DistortionType")
+    nb::enum_<SynthOscillator::DistortionType>(m_constants, "DistortionType", nb::is_arithmetic())
             .value("None", SynthOscillator::DistortionType::kNone)
             .value("Sync", SynthOscillator::DistortionType::kSync)
             .value("Formant", SynthOscillator::DistortionType::kFormant)
@@ -186,12 +372,9 @@ NB_MODULE(vita, m) {
             .value("FmSample", SynthOscillator::DistortionType::kFmSample)
             .value("RmOscillatorA", SynthOscillator::DistortionType::kRmOscillatorA)
             .value("RmOscillatorB", SynthOscillator::DistortionType::kRmOscillatorB)
-        .value("RmSample", SynthOscillator::DistortionType::kRmSample)
+        .value("RmSample", SynthOscillator::DistortionType::kRmSample);
-        .def("__int__", [](SynthOscillator::DistortionType self) {
-          return static_cast<int>(self);
-        });
         
-    nb::enum_<SynthOscillator::UnisonStackType>(m_constants, "UnisonStackType")
+    nb::enum_<SynthOscillator::UnisonStackType>(m_constants, "UnisonStackType", nb::is_arithmetic())
         .value("Normal", SynthOscillator::UnisonStackType::kNormal)
         .value("CenterDropOctave", SynthOscillator::UnisonStackType::kCenterDropOctave)
         .value("CenterDropOctave2", SynthOscillator::UnisonStackType::kCenterDropOctave2)
@@ -203,75 +386,54 @@ NB_MODULE(vita, m) {
         .value("MinorChord", SynthOscillator::UnisonStackType::kMinorChord)
         .value("HarmonicSeries", SynthOscillator::UnisonStackType::kHarmonicSeries)
         .value("OddHarmonicSeries",
-               SynthOscillator::UnisonStackType::kOddHarmonicSeries)
+               SynthOscillator::UnisonStackType::kOddHarmonicSeries);
-        .def("__int__", [](SynthOscillator::UnisonStackType self) {
-          return static_cast<int>(self);
-        });
     
-    nb::enum_<RandomLfo::RandomType>(m_constants, "RandomLFOStyle")
+    nb::enum_<RandomLfo::RandomType>(m_constants, "RandomLFOStyle", nb::is_arithmetic())
         .value("Perlin", RandomLfo::RandomType::kPerlin)
         .value("SampleAndHold", RandomLfo::RandomType::kSampleAndHold)
         .value("SinInterpolate", RandomLfo::RandomType::kSinInterpolate)
-        .value("LorenzAttractor", RandomLfo::RandomType::kLorenzAttractor)
+        .value("LorenzAttractor", RandomLfo::RandomType::kLorenzAttractor);
-        .def("__int__",
-             [](RandomLfo::RandomType self) { return static_cast<int>(self); });
 
-    nb::enum_<VoiceHandler::VoicePriority>(m_constants, "VoicePriority")
+    nb::enum_<VoiceHandler::VoicePriority>(m_constants, "VoicePriority", nb::is_arithmetic())
         .value("Newest", VoiceHandler::VoicePriority::kNewest)
         .value("Oldest", VoiceHandler::VoicePriority::kOldest)
         .value("Highest", VoiceHandler::VoicePriority::kHighest)
         .value("Lowest", VoiceHandler::VoicePriority::kLowest)
-        .value("RoundRobin", VoiceHandler::VoicePriority::kRoundRobin)
+        .value("RoundRobin", VoiceHandler::VoicePriority::kRoundRobin);
-        .def("__int__", [](VoiceHandler::VoicePriority self) {
-          return static_cast<int>(self);
-        });
     
-    nb::enum_<VoiceHandler::VoiceOverride>(m_constants, "VoiceOverride")
+    nb::enum_<VoiceHandler::VoiceOverride>(m_constants, "VoiceOverride", nb::is_arithmetic())
         .value("Kill",VoiceHandler::VoiceOverride::kKill)
-        .value("Steal", VoiceHandler::VoiceOverride::kSteal)
+        .value("Steal", VoiceHandler::VoiceOverride::kSteal);
-        .def("__int__", [](VoiceHandler::VoiceOverride self) {
-          return static_cast<int>(self);
-        });
 
-    nb::enum_<PredefinedWaveFrames::Shape>(m_constants, "WaveShape")
+    nb::enum_<PredefinedWaveFrames::Shape>(m_constants, "WaveShape", nb::is_arithmetic())
         .value("Sin", PredefinedWaveFrames::kSin)
         .value("SaturatedSin", PredefinedWaveFrames::kSaturatedSin)
         .value("Triangle", PredefinedWaveFrames::kTriangle)
         .value("Square", PredefinedWaveFrames::kSquare)
         .value("Pulse", PredefinedWaveFrames::kPulse)
-        .value("Saw", PredefinedWaveFrames::kSaw)
+        .value("Saw", PredefinedWaveFrames::kSaw);
-        .def("__int__", [](PredefinedWaveFrames::Shape self) {
-          return static_cast<int>(self);
-        });
 
-    nb::enum_<SynthLfo::SyncType>(m_constants, "SynthLFOSyncType")
+    nb::enum_<SynthLfo::SyncType>(m_constants, "SynthLFOSyncType", nb::is_arithmetic())
         .value("Trigger", SynthLfo::SyncType::kTrigger)
         .value("Sync", SynthLfo::SyncType::kSync)
         .value("Envelope", SynthLfo::SyncType::kEnvelope)
         .value("SustainEnvelope", SynthLfo::SyncType::kSustainEnvelope)
         .value("LoopPoint", SynthLfo::SyncType::kLoopPoint)
-        .value("LoopHold", SynthLfo::SyncType::kLoopHold)
+        .value("LoopHold", SynthLfo::SyncType::kLoopHold);
-        .def("__int__",
-             [](SynthLfo::SyncType self) { return static_cast<int>(self); });
     
-    nb::enum_<MultibandCompressor::BandOptions>(m_constants, "CompressorBandOption")
+    nb::enum_<MultibandCompressor::BandOptions>(m_constants, "CompressorBandOption", nb::is_arithmetic())
         .value("Multiband", MultibandCompressor::BandOptions::kMultiband)
         .value("LowBand", MultibandCompressor::BandOptions::kLowBand)
         .value("HighBand", MultibandCompressor::BandOptions::kHighBand)
-        .value("SingleBand", MultibandCompressor::BandOptions::kSingleBand)
+        .value("SingleBand", MultibandCompressor::BandOptions::kSingleBand);
-        .def("__int__", [](MultibandCompressor::BandOptions self) {
-          return static_cast<int>(self);
-        });
     
-    nb::enum_<SynthFilter::Style>(m_constants, "SynthFilterStyle")
+    nb::enum_<SynthFilter::Style>(m_constants, "SynthFilterStyle", nb::is_arithmetic())
         .value("k12Db", SynthFilter::Style::k12Db)
         .value("k24Db", SynthFilter::Style::k24Db)
         .value("NotchPassSwap", SynthFilter::Style::kNotchPassSwap)
         .value("DualNotchBand", SynthFilter::Style::kDualNotchBand)
         .value("BandPeakNotch", SynthFilter::Style::kBandPeakNotch)
-        .value("Shelving", SynthFilter::Style::kShelving)
+        .value("Shelving", SynthFilter::Style::kShelving);
-        .def("__int__",
-             [](SynthFilter::Style self) { return static_cast<int>(self); });
     
 //    https://github.com/mtytel/vital/blob/636ca0ef517a4db087a6a08a6a8a5e704e21f836/src/interface/look_and_feel/synth_strings.h#L174
     enum SyncedFrequencyName {
@@ -289,7 +451,7 @@ NB_MODULE(vita, m) {
         k1_64
     };
     
-    nb::enum_<SyncedFrequencyName>(m_constants, "SyncedFrequency")
+    nb::enum_<SyncedFrequencyName>(m_constants, "SyncedFrequency", nb::is_arithmetic())
         .value("k32_1", SyncedFrequencyName::k32_1)
         .value("k16_1", SyncedFrequencyName::k16_1)
         .value("k8_1", SyncedFrequencyName::k8_1)
@@ -301,9 +463,7 @@ NB_MODULE(vita, m) {
         .value("k1_8", SyncedFrequencyName::k1_8)
         .value("k1_16", SyncedFrequencyName::k1_16)
         .value("k1_32", SyncedFrequencyName::k1_32)
-        .value("k1_64", SyncedFrequencyName::k1_64)
+        .value("k1_64", SyncedFrequencyName::k1_64);
-        .def("__int__",
-             [](SyncedFrequencyName self) { return static_cast<int>(self); });
         
 //    https://github.com/mtytel/vital/blob/636ca0ef517a4db087a6a08a6a8a5e704e21f836/src/synthesis/modulators/synth_lfo.h#L58C1-L65C9
     enum SyncOption {
@@ -314,13 +474,12 @@ NB_MODULE(vita, m) {
         kKeytrack,
     };
     
-    nb::enum_<SyncOption>(m_constants, "SynthLFOSyncOption")
+    nb::enum_<SyncOption>(m_constants, "SynthLFOSyncOption", nb::is_arithmetic())
         .value("Time", SyncOption::kTime)
         .value("Tempo", SyncOption::kTempo)
         .value("DottedTempo", SyncOption::kDottedTempo)
         .value("TripletTempo", SyncOption::kTripletTempo)
-        .value("Keytrack", SyncOption::kKeytrack)
+        .value("Keytrack", SyncOption::kKeytrack);
-        .def("__int__", [](SyncOption self) { return static_cast<int>(self); });
 
     // Binding for poly_float
     nb::class_<vital::poly_float>(m, "poly_float")
@@ -374,11 +533,32 @@ NB_MODULE(vita, m) {
             return "<CRValue value=" + std::to_string(v.value()) + ">";
         });
     
+    // Bind the ControlValue wrapper class
+    nb::class_<ControlValue>(m, "ControlValue")
+        .def("value", &ControlValue::value)
+        .def("set", nb::overload_cast<double>(&ControlValue::set), nb::arg("value"))
+        .def("set", nb::overload_cast<int>(&ControlValue::set), nb::arg("value"))
+        .def("set_normalized", &ControlValue::set_normalized, nb::arg("value"),
+             "Set control value using normalized 0-1 range")
+        .def("get_normalized", &ControlValue::get_normalized,
+             "Get control value as normalized 0-1 range")
+        .def("get_text", &ControlValue::get_text,
+             "Get formatted display text for the control");
+    
     // Expose the SynthBase class, specifying ProcessorRouter as its base
     nb::class_<HeadlessSynth>(m, "Synth")
         .def(nb::init<>())  // Ensure there's a default constructor or adjust
                             // accordingly
                             // Bind the first overload of connectModulation
+
+        .def("__getstate__", [](HeadlessSynth &synth) {
+               return const_cast<HeadlessSynth &>(synth).pyToJson();  // Removes const safely
+        })
+        .def("__setstate__", [](HeadlessSynth &synth, const std::string &json) {
+             new (&synth) HeadlessSynth();
+             synth.loadFromString(json);
+        })
+
         .def("connect_modulation",
              nb::overload_cast<const std::string &, const std::string &>(
                  &HeadlessSynth::pyConnectModulation),
@@ -392,6 +572,7 @@ NB_MODULE(vita, m) {
              "Disconnects a modulation source from a destination by name.")
 
         .def("set_bpm", &HeadlessSynth::pySetBPM, nb::arg("bpm"))
+        .def("set_sample_rate", &HeadlessSynth::setSampleRate, nb::arg("sample_rate"))
 
         .def("render_file", &HeadlessSynth::renderAudioToFile2,
              nb::arg("output_path"), nb::arg("midi_note"),
@@ -430,5 +611,21 @@ NB_MODULE(vita, m) {
         .def("load_init_preset", &HeadlessSynth::loadInitPreset, "Load the initial preset.")
     
         .def("clear_modulations", &HeadlessSynth::clearModulations)
-        .def("get_controls", &HeadlessSynth::getControls, nb::rv_policy::reference);
+        .def("get_controls", [](HeadlessSynth &synth) {
+            nb::dict result;
+            auto &controls = synth.getControls();
+            for (const auto &[name, value] : controls) {
+                result[name.c_str()] = ControlValue(value, name, &synth);
+            }
+            return result;
+        }, nb::rv_policy::reference_internal)
+        .def("get_control_details", [](HeadlessSynth &synth, const std::string &name) {
+            // Validate control name
+            if (!vital::Parameters::isParameter(name))
+                throw std::runtime_error("No metadata for control: " + name);
+            // Return parameter metadata
+            return vital::Parameters::getDetails(name);
+        }, nb::arg("name"), "Get metadata for a control")
+        .def("get_control_text", get_control_text)
+        ;
 }

tests/test_normalized_params.py

@@ -0,0 +1,144 @@
+import pytest
+import vita
+from vita.constants import ValueScale
+
+
+def test_normalized_linear_parameter():
+    """Test normalized control on a linear parameter"""
+    synth = vita.Synth()
+    
+    # Get a linear parameter (most parameters are linear by default)
+    info = synth.get_control_details("filter_1_cutoff")
+    if info.scale != ValueScale.Linear:
+        pytest.skip("filter_1_cutoff is not linear in this version")
+    
+    # Test boundary values
+    controls = synth.get_controls()
+    controls["filter_1_cutoff"].set_normalized(0.0)
+    assert abs(controls["filter_1_cutoff"].get_normalized() - 0.0) < 0.001
+    assert abs(controls["filter_1_cutoff"].value() - info.min) < 0.001
+    
+    controls["filter_1_cutoff"].set_normalized(1.0)
+    assert abs(controls["filter_1_cutoff"].get_normalized() - 1.0) < 0.001
+    assert abs(controls["filter_1_cutoff"].value() - info.max) < 0.001
+    
+    # Test middle value
+    controls["filter_1_cutoff"].set_normalized(0.5)
+    assert abs(controls["filter_1_cutoff"].get_normalized() - 0.5) < 0.001
+    expected_mid = info.min + 0.5 * (info.max - info.min)
+    assert abs(controls["filter_1_cutoff"].value() - expected_mid) < 0.001
+
+
+def test_normalized_quartic_parameter():
+    """Test normalized control on a quartic parameter like env_1_delay"""
+    synth = vita.Synth()
+    
+    # Verify env_1_delay uses quartic scaling
+    info = synth.get_control_details("env_1_delay")
+    assert info.scale == ValueScale.Quartic
+    
+    # Test boundary values
+    controls = synth.get_controls()
+    controls["env_1_delay"].set_normalized(0.0)
+    assert abs(controls["env_1_delay"].get_normalized() - 0.0) < 0.001
+    
+    controls["env_1_delay"].set_normalized(1.0)
+    assert abs(controls["env_1_delay"].get_normalized() - 1.0) < 0.001
+    
+    # Test that normalized 0.5 maps to 0.25 seconds display (0.5^4 * 4.0)
+    # For quartic parameters in VST, normalized maps linearly to internal range
+    # but the knob DISPLAY position has a quartic relationship
+    controls["env_1_delay"].set_normalized(0.5)
+    expected_value = info.min + 0.5 * (info.max - info.min)  # Linear mapping
+    assert abs(controls["env_1_delay"].value() - expected_value) < 0.001
+    assert abs(controls["env_1_delay"].get_normalized() - 0.5) < 0.001
+    
+    actual_value = controls["env_1_delay"].value()
+    linear_mid = info.min + 0.5 * (info.max - info.min)
+    
+    # With this implementation, normalized maps linearly to internal range
+    assert abs(actual_value - linear_mid) < 0.001
+
+
+def test_normalized_indexed_parameter():
+    """Test normalized control on an indexed/discrete parameter"""
+    synth = vita.Synth()
+    
+    # delay_style is an indexed parameter
+    info = synth.get_control_details("delay_style")
+    assert info.scale == ValueScale.Indexed
+    assert info.is_discrete
+    
+    num_options = len(info.options)
+    
+    # Test each discrete value
+    controls = synth.get_controls()
+    for i in range(num_options):
+        normalized = i / (num_options - 1) if num_options > 1 else 0
+        controls["delay_style"].set_normalized(normalized)
+        
+        # Check it maps to the correct index
+        actual_index = int(controls["delay_style"].value() - info.min)
+        assert actual_index == i
+        
+        # Check text matches
+        assert controls["delay_style"].get_text() == info.options[i]
+
+
+def test_normalized_vst_style_automation():
+    """Demonstrate VST-style parameter automation using normalized values"""
+    synth = vita.Synth()
+    
+    # Simulate a VST automation curve for filter cutoff
+    # This would be how a DAW sends parameter changes
+    automation_points = [
+        (0.0, 0.0),    # Start closed
+        (0.25, 0.5),   # Open to middle
+        (0.5, 1.0),    # Full open
+        (0.75, 0.3),   # Partially close
+        (1.0, 0.0),    # Close again
+    ]
+    
+    controls = synth.get_controls()
+    for time, normalized_value in automation_points:
+        controls["filter_1_cutoff"].set_normalized(normalized_value)
+        
+        # Verify the normalized value is preserved
+        retrieved = controls["filter_1_cutoff"].get_normalized()
+        assert abs(retrieved - normalized_value) < 0.001
+        
+        # In a real scenario, you would render audio here
+        # audio = synth.render(60, 0.8, 0.1, 0.1)
+
+
+def test_normalized_clipping():
+    """Test that normalized values are properly clipped to 0-1 range"""
+    synth = vita.Synth()
+    
+    # Test values outside 0-1 range
+    controls = synth.get_controls()
+    controls["filter_1_cutoff"].set_normalized(-0.5)
+    assert controls["filter_1_cutoff"].get_normalized() == 0.0
+    
+    controls["filter_1_cutoff"].set_normalized(1.5)
+    assert controls["filter_1_cutoff"].get_normalized() == 1.0
+
+
+if __name__ == "__main__":
+    # Run basic tests
+    test_normalized_linear_parameter()
+    print("✓ Linear parameter test passed")
+    
+    test_normalized_quartic_parameter()
+    print("✓ Quartic parameter test passed")
+    
+    test_normalized_indexed_parameter()
+    print("✓ Indexed parameter test passed")
+    
+    test_normalized_vst_style_automation()
+    print("✓ VST-style automation test passed")
+    
+    test_normalized_clipping()
+    print("✓ Clipping test passed")
+    
+    print("\nAll normalized parameter tests passed!")

tests/test_render.py

@@ -20,15 +20,14 @@ from vita.constants import (
     SyncedFrequency,
 )
 
-SAMPLE_RATE = 44_100
 
-
+def test_render(bpm=120.0, sample_rate=48000, note_dur=1.0, render_dur=3.0, pitch=36, velocity=0.7):
-def test_render(bpm=120.0, note_dur=1.0, render_dur=3.0, pitch=36, velocity=0.7):
 
     synth = vita.Synth()
     # The initial preset is laoded by default.
 
     synth.set_bpm(bpm)
+    synth.set_sample_rate(sample_rate)
 
     assert vita.get_modulation_sources()
     assert vita.get_modulation_destinations()
@@ -38,12 +37,14 @@ def test_render(bpm=120.0, note_dur=1.0, render_dur=3.0, pitch=36, velocity=0.7)
     controls = synth.get_controls()
     controls["modulation_1_amount"].set(1.0)
     controls["filter_1_on"].set(1.0)
+    assert 1.0 == controls["filter_1_on"].value()
     controls["lfo_1_tempo"].set(SyncedFrequency.k1_16)
 
     # Render audio to numpy array shaped (2, NUM_SAMPLES)
     audio = synth.render(pitch, velocity, note_dur, render_dur)
+    assert sample_rate == int(audio.shape[1] / render_dur) # assume int
 
-    wavfile.write("generated_preset.wav", SAMPLE_RATE, audio.T)
+    wavfile.write("generated_preset.wav", sample_rate, audio.T)
 
     # Dump current state to json text
     json_text = synth.to_json()
@@ -53,8 +54,10 @@ def test_render(bpm=120.0, note_dur=1.0, render_dur=3.0, pitch=36, velocity=0.7)
 
     # Load JSON text
     with open(preset_path, "r") as f:
-        json_text = f.read()
+        json_text1 = f.read()
-        assert synth.load_json(json_text)
+        assert synth.load_json(json_text1)
+
+    assert json_text == json_text1
 
     # Or load directly from file:
     assert synth.load_preset(preset_path)
@@ -63,3 +66,42 @@ def test_render(bpm=120.0, note_dur=1.0, render_dur=3.0, pitch=36, velocity=0.7)
     synth.load_init_preset()
     # Or just clear modulations.
     synth.clear_modulations()
+
+    info = synth.get_control_details("delay_style")
+    print("min:", info.min)
+    print("max:", info.max)
+    print("default_value:", info.default_value)
+    print("scale:", info.scale)           # e.g. ValueScale.Indexed
+    print("discrete:", info.is_discrete)  # True
+    print("options: ", info.options)      # ["Mono","Stereo","Ping Pong","Mid Ping Pong"]
+    print("display_name:", info.display_name)
+    print("display_units:", info.display_units)
+
+    controls["delay_style"].set(0)
+    text = synth.get_control_text("delay_style")
+    assert text == info.options[0]
+    print("text: ", text)
+    controls["delay_style"].set(1)
+    text = synth.get_control_text("delay_style")
+    assert text == info.options[1]
+    print("text: ", text)
+
+    assert info.is_discrete
+    for i in range(int(info.min), int(info.max)+1):
+        controls["delay_style"].set(i)
+
+    info = synth.get_control_details("env_1_delay")
+    print("min:", info.min)
+    print("max:", info.max)
+    print("default_value:", info.default_value)
+    print("scale:", info.scale)           # e.g. ValueScale.Quartic
+    print("discrete:", info.is_discrete)  # False
+    print("options: ", info.options)      # [""]
+
+    assert not info.is_discrete
+    steps = 100
+    for i in range(steps):
+        pct = i/(steps-1)
+        # linearly interpolate
+        y = info.min + pct * (info.max-info.min)
+        controls["env_1_delay"].set(y)

third_party/nanobind

@@ -1 +1 @@
-Subproject commit efbeb8afd95b210d9e2e06f719ddc1336a12b9d7
+Subproject commit 109af19428a8784aa02fed55a5b3e21617de93ef

vita/__init__.py

@@ -1,2 +1,9 @@
-from .vita import *
+from .vita import Synth, constants, get_modulation_sources, get_modulation_destinations
-from .version import *
+from .version import __version__
+
+__ALL__ = [
+    "Synth",
+    "constants",
+    "get_modulation_sources",
+    "get_modulation_destinations",
+]

vita/constants/__init__.py

@@ -1 +1,39 @@
-from ..vita.constants import *
+from ..vita.constants import (
+    SourceDestination,
+    Effect,
+    FilterModel,
+    RetriggerStyle,
+    SpectralMorph,
+    DistortionType,
+    UnisonStackType,
+    RandomLFOStyle,
+    SynthFilterStyle,
+    WaveShape,
+    CompressorBandOption,
+    VoiceOverride,
+    VoicePriority,
+    SynthLFOSyncOption,
+    SynthLFOSyncType,
+    SyncedFrequency,
+    ValueScale,
+)
+
+__ALL__ = [
+    "SourceDestination",
+    "Effect",
+    "FilterModel",
+    "RetriggerStyle",
+    "SpectralMorph",
+    "DistortionType",
+    "UnisonStackType",
+    "RandomLFOStyle",
+    "SynthFilterStyle",
+    "WaveShape",
+    "CompressorBandOption",
+    "VoiceOverride",
+    "VoicePriority",
+    "SynthLFOSyncOption",
+    "SynthLFOSyncType",
+    "SyncedFrequency",
+    "ValueScale",
+]

vita/version.py

@@ -1 +1 @@
-__version__ = "0.0.3"
+__version__ = "0.0.5"