Revert "fix click: 5ms fade-out from last sample to zero before silence padding"

This reverts commit 84474731e7.

Robovoice.App/AudioOutput.cs

@@ -8,7 +8,6 @@ internal sealed class AudioOutput : IDisposable
     private BufferedWaveProvider? _bufferProvider;
     private int _sampleRate;
     private string _deviceName = string.Empty;
-    private float _lastSample;
     private bool _disposed;
 
     public Action<string>? Log { get; set; }
@@ -19,7 +18,6 @@ internal sealed class AudioOutput : IDisposable
 
         _sampleRate = sampleRate;
         _deviceName = deviceName ?? string.Empty;
-        _lastSample = 0f;
 
         Stop();
 
@@ -44,9 +42,6 @@ internal sealed class AudioOutput : IDisposable
         ObjectDisposedException.ThrowIf(_disposed, this);
         if (_bufferProvider is null) return;
 
-        if (samples.Length > 0)
-            _lastSample = samples[^1];
-
         byte[] bytes = new byte[samples.Length * sizeof(float)];
         Buffer.BlockCopy(samples, 0, bytes, 0, bytes.Length);
         _bufferProvider.AddSamples(bytes, 0, bytes.Length);
@@ -57,21 +52,8 @@ internal sealed class AudioOutput : IDisposable
         ObjectDisposedException.ThrowIf(_disposed, this);
         if (_bufferProvider is null || _sampleRate == 0) return;
 
-        // Fade out from last sample to zero over 5ms to avoid click
-        int fadeSamples = (int)(_sampleRate * 0.005);
-        float[] fade = new float[fadeSamples];
-        for (int i = 0; i < fadeSamples; i++)
-        {
-            float t = (float)i / fadeSamples;
-            fade[i] = _lastSample * (1f - t);
-        }
-        WriteSamples(fade);
-
-        // Then 500ms of silence to let NAudio drain
         int padSamples = (int)(_sampleRate * 0.5);
         WriteSamples(new float[padSamples]);
-        
-        _lastSample = 0f;
     }
 
     private void OnPlaybackStopped(object? sender, StoppedEventArgs e)
@@ -89,7 +71,6 @@ internal sealed class AudioOutput : IDisposable
         }
         _bufferProvider?.ClearBuffer();
         _bufferProvider = null;
-        _lastSample = 0f;
     }
 
     private static int FindDevice(string? deviceName)