v0.2: streaming playback, model params, text input

- Stream audio directly to device via BufferedWaveProvider (no temp WAVs)
- Add Noise/Speed/NoiseW sliders with live value labels
- Sliders reinit engine on MouseUp (not Scroll) to avoid locking
- Add text input field with Speak button for direct synthesis
- Test button uses text input if non-empty
- Fix sentence terminator auto-append (espeak-ng final-word drop)
- Fix UTF-8 text marshaling (piper_synthesize_start keeps text ref)
- Fix voice catalogue language column (JSON snake_case mapping)
- Use piper_default_synthesize_options for model-specific defaults
- Fix nullable warnings in designer files
- Fix unused _playing field in AudioOutput

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 bool _playing;
     private bool _disposed;
 
     public Action<string>? Log { get; set; }
@@ -35,7 +34,6 @@ internal sealed class AudioOutput : IDisposable
 
         _waveOut.Init(_bufferProvider);
         _waveOut.PlaybackStopped += OnPlaybackStopped;
-        _playing = true;
         _waveOut.Play();
     }
 
@@ -60,7 +58,6 @@ internal sealed class AudioOutput : IDisposable
 
     private void OnPlaybackStopped(object? sender, StoppedEventArgs e)
     {
-        _playing = false;
     }
 
     public void Stop()
@@ -74,7 +71,6 @@ internal sealed class AudioOutput : IDisposable
         }
         _bufferProvider?.ClearBuffer();
         _bufferProvider = null;
-        _playing = false;
     }
 
     private static int FindDevice(string? deviceName)

Robovoice.App/MainForm.Designer.cs

@@ -1,3 +1,4 @@
+#nullable enable
 namespace Robovoice.App;
 
 partial class MainForm
@@ -22,6 +23,15 @@ partial class MainForm
     private Label lblTextInput = null!;
     private TextBox txtTextInput = null!;
     private Button btnSpeakInput = null!;
+    private Label lblNoise = null!;
+    private TrackBar trkNoise = null!;
+    private Label lblNoiseVal = null!;
+    private Label lblSpeed = null!;
+    private TrackBar trkSpeed = null!;
+    private Label lblSpeedVal = null!;
+    private Label lblNoiseW = null!;
+    private TrackBar trkNoiseW = null!;
+    private Label lblNoiseWVal = null!;
 
     protected override void Dispose(bool disposing)
     {
@@ -52,6 +62,15 @@ partial class MainForm
         lblTextInput = new Label();
         txtTextInput = new TextBox();
         btnSpeakInput = new Button();
+        lblNoise = new Label();
+        trkNoise = new TrackBar();
+        lblNoiseVal = new Label();
+        lblSpeed = new Label();
+        trkSpeed = new TrackBar();
+        lblSpeedVal = new Label();
+        lblNoiseW = new Label();
+        trkNoiseW = new TrackBar();
+        lblNoiseWVal = new Label();
 
         SuspendLayout();
 
@@ -126,23 +145,86 @@ partial class MainForm
         lblLineStatus.TextAlign = ContentAlignment.MiddleRight;
         lblLineStatus.ForeColor = Color.DarkBlue;
 
+        // lblNoise
+        lblNoise.Text = "Noise:";
+        lblNoise.Location = new Point(12, 82);
+        lblNoise.Size = new Size(40, 23);
+        lblNoise.TextAlign = ContentAlignment.MiddleLeft;
+
+        // trkNoise (0-1000 → 0.0-1.0, default 667)
+        trkNoise.Location = new Point(52, 78);
+        trkNoise.Size = new Size(120, 45);
+        trkNoise.Minimum = 0;
+        trkNoise.Maximum = 1000;
+        trkNoise.Value = 667;
+        trkNoise.TickFrequency = 200;
+        trkNoise.Orientation = Orientation.Horizontal;
+
+        // lblNoiseVal
+        lblNoiseVal.Text = "0.667";
+        lblNoiseVal.Location = new Point(175, 82);
+        lblNoiseVal.Size = new Size(35, 23);
+        lblNoiseVal.TextAlign = ContentAlignment.MiddleLeft;
+
+        // lblSpeed
+        lblSpeed.Text = "Speed:";
+        lblSpeed.Location = new Point(220, 82);
+        lblSpeed.Size = new Size(40, 23);
+        lblSpeed.TextAlign = ContentAlignment.MiddleLeft;
+
+        // trkSpeed (50-300 → 0.5-3.0, default 100)
+        trkSpeed.Location = new Point(260, 78);
+        trkSpeed.Size = new Size(120, 45);
+        trkSpeed.Minimum = 50;
+        trkSpeed.Maximum = 300;
+        trkSpeed.Value = 100;
+        trkSpeed.TickFrequency = 50;
+        trkSpeed.Orientation = Orientation.Horizontal;
+
+        // lblSpeedVal
+        lblSpeedVal.Text = "1.00";
+        lblSpeedVal.Location = new Point(383, 82);
+        lblSpeedVal.Size = new Size(35, 23);
+        lblSpeedVal.TextAlign = ContentAlignment.MiddleLeft;
+
+        // lblNoiseW
+        lblNoiseW.Text = "NoiseW:";
+        lblNoiseW.Location = new Point(428, 82);
+        lblNoiseW.Size = new Size(45, 23);
+        lblNoiseW.TextAlign = ContentAlignment.MiddleLeft;
+
+        // trkNoiseW (0-1000 → 0.0-1.0, default 800)
+        trkNoiseW.Location = new Point(475, 78);
+        trkNoiseW.Size = new Size(120, 45);
+        trkNoiseW.Minimum = 0;
+        trkNoiseW.Maximum = 1000;
+        trkNoiseW.Value = 800;
+        trkNoiseW.TickFrequency = 200;
+        trkNoiseW.Orientation = Orientation.Horizontal;
+
+        // lblNoiseWVal
+        lblNoiseWVal.Text = "0.800";
+        lblNoiseWVal.Location = new Point(598, 82);
+        lblNoiseWVal.Size = new Size(45, 23);
+        lblNoiseWVal.TextAlign = ContentAlignment.MiddleLeft;
+
         // txtLog
-        txtLog.Location = new Point(12, 112);
+        txtLog.Location = new Point(12, 149);
         txtLog.Size = new Size(800, 310);
 
         // lblTextInput
         lblTextInput.Text = "Text:";
-        lblTextInput.Location = new Point(12, 84);
+        lblTextInput.Location = new Point(12, 121);
         lblTextInput.Size = new Size(35, 23);
         lblTextInput.TextAlign = ContentAlignment.MiddleLeft;
 
         // txtTextInput
-        txtTextInput.Location = new Point(50, 81);
+        txtTextInput.Location = new Point(50, 118);
         txtTextInput.Size = new Size(680, 23);
 
         // btnSpeakInput
         btnSpeakInput.Text = "Speak";
-        btnSpeakInput.Location = new Point(737, 80);
+        btnSpeakInput.Location = new Point(737, 117);
         btnSpeakInput.Size = new Size(75, 25);
         btnSpeakInput.UseVisualStyleBackColor = true;
         txtLog.ReadOnly = true;
@@ -152,20 +234,20 @@ partial class MainForm
 
         // chkMinimizeToTray
         chkMinimizeToTray.Text = "Minimize to tray on close";
-        chkMinimizeToTray.Location = new Point(12, 440);
+        chkMinimizeToTray.Location = new Point(12, 477);
         chkMinimizeToTray.Size = new Size(180, 24);
         chkMinimizeToTray.UseVisualStyleBackColor = true;
 
         // btnClearLog
         btnClearLog.Text = "Clear Log";
-        btnClearLog.Location = new Point(737, 438);
+        btnClearLog.Location = new Point(737, 475);
         btnClearLog.Size = new Size(75, 25);
         btnClearLog.UseVisualStyleBackColor = true;
 
         // MainForm
         AutoScaleDimensions = new SizeF(7F, 15F);
         AutoScaleMode = AutoScaleMode.Font;
-        ClientSize = new Size(824, 472);
+        ClientSize = new Size(824, 509);
         Controls.Add(lblPttKey);
         Controls.Add(cmbPttKey);
         Controls.Add(lblVoice);
@@ -178,13 +260,22 @@ partial class MainForm
         Controls.Add(btnBrowseFile);
         Controls.Add(lblFileName);
         Controls.Add(lblLineStatus);
+        Controls.Add(lblNoise);
+        Controls.Add(trkNoise);
+        Controls.Add(lblNoiseVal);
+        Controls.Add(lblSpeed);
+        Controls.Add(trkSpeed);
+        Controls.Add(lblSpeedVal);
+        Controls.Add(lblNoiseW);
+        Controls.Add(trkNoiseW);
+        Controls.Add(lblNoiseWVal);
         Controls.Add(lblTextInput);
         Controls.Add(txtTextInput);
         Controls.Add(btnSpeakInput);
         Controls.Add(txtLog);
         Controls.Add(chkMinimizeToTray);
         Controls.Add(btnClearLog);
-        MinimumSize = new Size(840, 510);
+        MinimumSize = new Size(840, 547);
         Text = "Robovoice";
         FormBorderStyle = FormBorderStyle.FixedSingle;
         MaximizeBox = false;

Robovoice.App/MainForm.cs

@@ -49,6 +49,13 @@ internal sealed partial class MainForm : Form
         cmbOutput.SelectedIndexChanged += OnOutputChanged;
         cmbVoice.SelectedIndexChanged += OnVoiceChanged;
 
+        trkNoise.Scroll += OnSliderScroll;
+        trkSpeed.Scroll += OnSliderScroll;
+        trkNoiseW.Scroll += OnSliderScroll;
+        trkNoise.MouseUp += OnSliderReleased;
+        trkSpeed.MouseUp += OnSliderReleased;
+        trkNoiseW.MouseUp += OnSliderReleased;
+
         SetupTray();
 
         await InitializeEngineAsync();
@@ -124,7 +131,12 @@ internal sealed partial class MainForm : Form
         _audioOutput?.Dispose();
         _tts?.DisposeAsync().AsTask().Wait();
 
-        _tts = new LibPiperTtsEngine(modelPath, _espeakDataPath);
+        _tts = new LibPiperTtsEngine(
+            modelPath,
+            _espeakDataPath,
+            noiseScale: trkNoise.Value / 1000.0f,
+            lengthScale: trkSpeed.Value / 100.0f,
+            noiseWScale: trkNoiseW.Value / 1000.0f);
         _audioOutput = new AudioOutput();
         _sttSource = new FileSttSource();
         _orchestrator?.DisposeAsync().AsTask().Wait();
@@ -272,6 +284,21 @@ internal sealed partial class MainForm : Form
         await InitializeEngineAsync();
     }
 
+    private void OnSliderScroll(object? sender, EventArgs e)
+    {
+        lblNoiseVal.Text = $"{trkNoise.Value / 1000.0:F3}";
+        lblSpeedVal.Text = $"{trkSpeed.Value / 100.0:F2}";
+        lblNoiseWVal.Text = $"{trkNoiseW.Value / 1000.0:F3}";
+    }
+
+    private void OnSliderReleased(object? sender, MouseEventArgs e)
+    {
+        if (cmbVoice.SelectedItem is string name && VoiceCatalogue.IsVoiceInstalled(_voicesDir, name))
+        {
+            _ = InitializeEngineAsync();
+        }
+    }
+
     private void OnPttKeyChanged(object? sender, EventArgs e)
     {
         SetupHotkey();

Robovoice.App/VoiceManagerForm.Designer.cs

@@ -1,3 +1,4 @@
+#nullable enable
 namespace Robovoice.App;
 
 partial class VoiceManagerForm