Let AGC raise the noise floor further to bring up a distant voice

AGC2 won't amplify the background noise above -50 dBFS, which also caps
the gain for a voice barely above that noise: a distant talker ended up
5 dB quieter than a near one with noise suppression on, 12 dB with it
off. A "Boost quiet speech" setting (0-20 dB, default 0) raises the cap,
live, on desktop and Android.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

ts3-client/swing/src/main/java/com/ts3client/ui/DevicesPanel.java

@@ -33,6 +33,7 @@ final class DevicesPanel extends FormPanel {
     private final JSlider denoiseLevel;
     private final JCheckBox typingCheck;
     private final JCheckBox agcCheck;
+    private final JSlider agcBoost;
     private final JCheckBox mutedWarningCheck;
 
     DevicesPanel(Settings settings, AudioIo io, VoiceOutput livePlayback,
@@ -99,6 +100,12 @@ final class DevicesPanel extends FormPanel {
         agcCheck.setToolTipText("<html><b>Automatic gain control</b> normalises your "
                 + "microphone loudness to a target level, boosting quiet mics and taming "
                 + "loud ones.</html>");
+        agcBoost = new JSlider(0, Settings.MAX_AGC_BOOST_DB, settings.agcBoostDb);
+        agcBoost.setMajorTickSpacing(5);
+        agcBoost.setPaintTicks(true);
+        limitWidth(agcBoost, SLIDER_WIDTH);
+        agcBoost.setToolTipText("<html>Lets AGC bring up a quiet or distant voice further, "
+                + "at the cost of up to this many dB more background noise (0&ndash;20 dB).</html>");
 
         c.gridx = 0;
         c.gridy = row++;
@@ -113,9 +120,11 @@ final class DevicesPanel extends FormPanel {
         c.gridy = row++;
         add(agcCheck, c);
         c.gridwidth = 1;
+        addRow(this, c, row++, new JLabel("Boost quiet speech:"), agcBoost);
 
         Runnable syncNoise = () -> {
             denoiseLevel.setEnabled(denoiseCheck.isSelected());
+            agcBoost.setEnabled(agcCheck.isSelected());
             applyLive.accept(m -> {
                 m.setNoiseSuppression(denoiseCheck.isSelected());
                 m.setDenoiserLevel(denoiseLevel.getValue());
@@ -128,6 +137,8 @@ final class DevicesPanel extends FormPanel {
         agcCheck.addActionListener(e -> syncNoise.run());
         denoiseLevel.addChangeListener(e ->
                 applyLive.accept(m -> m.setDenoiserLevel(denoiseLevel.getValue())));
+        agcBoost.addChangeListener(e ->
+                applyLive.accept(m -> m.setAgcBoost(agcBoost.getValue())));
         syncNoise.run();
 
         mutedWarningCheck = new JCheckBox("Beep when talking while muted", settings.mutedTalkWarning);
@@ -156,6 +167,7 @@ final class DevicesPanel extends FormPanel {
         target.denoiserLevel = denoiseLevel.getValue();
         target.typingAttenuation = typingCheck.isSelected();
         target.agc = agcCheck.isSelected();
+        target.agcBoostDb = agcBoost.getValue();
         target.mutedTalkWarning = mutedWarningCheck.isSelected();
     }