Initial release — InstaGrain granular synthesizer v1.0

8-voice polyphonic granular synth (VST3/AU/LV2) with:
- 128 grain pool per voice, Hann windowing, linear interpolation
- Root note selector, sample rate correction, sustain pedal (CC64)
- Scatter controls, direction modes (Fwd/Rev/PingPong), freeze
- ADSR envelope, global filter (LP/HP/BP), reverb
- Waveform display with grain visualization
- Drag & drop sample loading, full state save/restore
- CI/CD for Windows/macOS/Linux

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Source/GrainVoice.h

@@ -0,0 +1,40 @@
+#pragma once
+#include <JuceHeader.h>
+#include "GrainCloud.h"
+
+class GrainVoice
+{
+public:
+    GrainVoice();
+
+    void prepare (double sampleRate);
+    void noteOn (int midiNote, float velocity);
+    void noteOff();
+    void forceStop();
+    void processBlock (juce::AudioBuffer<float>& output, int numSamples,
+                       const juce::AudioBuffer<float>& sourceBuffer);
+    bool isActive() const { return voiceActive; }
+    int getCurrentNote() const { return currentNote; }
+
+    GrainCloud& getCloud() { return cloud; }
+    const GrainCloud& getCloud() const { return cloud; }
+
+    // ADSR parameters (set from processor)
+    // Root note reference (set from engine)
+    std::atomic<int> rootNote { 60 };
+
+    // ADSR parameters (set from processor)
+    std::atomic<float> attackTime  { 0.01f };
+    std::atomic<float> decayTime   { 0.1f };
+    std::atomic<float> sustainLevel { 1.0f };
+    std::atomic<float> releaseTime { 0.3f };
+
+private:
+    GrainCloud cloud;
+    juce::ADSR adsr;
+    juce::ADSR::Parameters adsrParams;
+    float velocityGain = 1.0f;
+    int currentNote = -1;
+    bool voiceActive = false;
+    double currentSampleRate = 44100.0;
+};