Simplify audio chain - bypass all effects to fix distortion

- Bypass colorizer entirely (master -> destination directly)
- Remove wave channel lowpass filter
- Clean, direct audio path with no processing
- Should eliminate all distortion artifacts

src-v2/audio/apu/APU.ts

@@ -77,19 +77,18 @@ export class GameBoyAPU {
     this.audioContext = audioContext || new AudioContext();
     this.config = { ...DEFAULT_V2_CONFIG, ...config };
     
-    // Create colorizer with DMG preset for authentic sound
+    // Create colorizer (but don't use it for now - bypassed)
     this.colorizer = new GameBoyColorizer(
       this.audioContext, 
-      GameBoyColorizer.createPreset('dmg')
+      GameBoyColorizer.createPreset()
     );
     
     // Create master gain
     this.masterGain = this.audioContext.createGain();
     this.masterGain.gain.value = this.config.masterVolume;
     
-    // Wire: master -> colorizer -> destination
-    this.masterGain.connect(this.colorizer.getInput());
-    this.colorizer.getOutput().connect(this.audioContext.destination);
+    // SIMPLIFIED: master -> destination (bypass colorizer to avoid distortion)
+    this.masterGain.connect(this.audioContext.destination);
     
     // Initialize all channels
     this.initializeChannels();

src-v2/audio/apu/WaveChannel.ts

@@ -34,7 +34,6 @@ export class WaveChannel {
   private volume: WaveVolume = 1; // Default to 100%
   private outputNode: GainNode;
   private currentPreset: WavePreset;
-  private lowpassFilter: BiquadFilterNode;
   
   constructor(
     audioContext: AudioContext,
@@ -45,14 +44,6 @@ export class WaveChannel {
     this.outputNode = outputNode;
     this.currentPreset = preset;
     
-    // Create a low-pass filter to warm up the sound
-    // GB wave channel had natural rolloff from the DAC
-    this.lowpassFilter = audioContext.createBiquadFilter();
-    this.lowpassFilter.type = 'lowpass';
-    this.lowpassFilter.frequency.value = 2000; // Cut harsh highs
-    this.lowpassFilter.Q.value = 0.7;
-    this.lowpassFilter.connect(outputNode);
-    
     // Initialize wavetable with preset
     this.waveTable = new WaveTable();
     this.loadPreset(preset);
@@ -158,9 +149,9 @@ export class WaveChannel {
     const stopTime = now + duration + releaseTime;
     gain.gain.linearRampToValueAtTime(0.001, stopTime);
     
-    // Connect nodes through low-pass filter for warmer sound
+    // Connect nodes directly to output
     oscillator.connect(gain);
-    gain.connect(this.lowpassFilter);
+    gain.connect(this.outputNode);
     
     // Schedule playback
     oscillator.start(now);
@@ -220,7 +211,7 @@ export class WaveChannel {
     gain.gain.linearRampToValueAtTime(0.001, stopTime);
     
     oscillator.connect(gain);
-    gain.connect(this.lowpassFilter);
+    gain.connect(this.outputNode);
     
     oscillator.start(now);
     oscillator.stop(stopTime + 0.01);