diff --git a/src/gui/FlexControlDialog.cpp b/src/gui/FlexControlDialog.cpp
index 1f3f3982..c3865cd3 100644
--- a/src/gui/FlexControlDialog.cpp
+++ b/src/gui/FlexControlDialog.cpp
@@ -257,6 +257,7 @@ const FlexActionDef kFlexActions[] = {
     {"WheelRit", "RIT (Receive Incremental Tuning)"},
     {"WheelXit", "XIT (Transmit Incremental Tuning)"},
     {"WheelVolume", "Master Volume"},
+    {"WheelSliceAudio", "Slice Audio Volume"},
     {"WheelHeadphoneVolume", "Headphone Volume"},
     {"WheelAgcT", "AGCT (Automatic Gain Control Threshold)"},
     {"WheelApf", "APF (Audio Peaking Filter)"},
@@ -452,6 +453,7 @@ bool isWheelActionId(const QString& actionId)
         // so saved bindings made before consolidation still register as
         // wheel actions in this predicate.
         || actionId == QLatin1String("WheelMasterAf")
+        || actionId == QLatin1String("WheelSliceAudio")
         || actionId == QLatin1String("WheelPower")
         || actionId == QLatin1String("WheelRit")
         || actionId == QLatin1String("WheelXit")
diff --git a/src/gui/MainWindow.h b/src/gui/MainWindow.h
index ab2f73e9..6907a306 100644
--- a/src/gui/MainWindow.h
+++ b/src/gui/MainWindow.h
@@ -138,6 +138,7 @@ enum class FlexWheelMode {
     Power,
     Rit,
     Xit,
+    SliceAudio,
     HeadphoneVolume,
     AgcT,
     Apf,
diff --git a/src/gui/MainWindow_Controllers.cpp b/src/gui/MainWindow_Controllers.cpp
index d1805eb8..c28cf0f9 100644
--- a/src/gui/MainWindow_Controllers.cpp
+++ b/src/gui/MainWindow_Controllers.cpp
@@ -67,6 +67,8 @@ bool flexWheelModeForAction(const QString& actionName, FlexWheelMode& mode)
         // Back-compat for saved FlexControl bindings made before #2986
         // consolidation.  Routes to the same Volume mode (master volume).
         mode = FlexWheelMode::Volume;
+    } else if (actionName == QLatin1String("WheelSliceAudio")) {
+        mode = FlexWheelMode::SliceAudio;
     } else if (actionName == QLatin1String("WheelHeadphoneVolume")) {
         mode = FlexWheelMode::HeadphoneVolume;
     } else if (actionName == QLatin1String("WheelAgcT")) {
@@ -250,6 +252,9 @@ void MainWindow::handleFlexControlTuneSteps(int steps)
     case FlexWheelMode::Xit:
         applyFlexControlWheelAction(QStringLiteral("WheelXit"), steps);
         break;
+    case FlexWheelMode::SliceAudio:
+        applyFlexControlWheelAction(QStringLiteral("WheelSliceAudio"), steps);
+        break;
     case FlexWheelMode::HeadphoneVolume:
         applyFlexControlWheelAction(QStringLiteral("WheelHeadphoneVolume"), steps);
         break;
@@ -966,6 +971,7 @@ void MainWindow::refreshStreamDeckLabels()
         {QStringLiteral("WheelRit"),            QStringLiteral("RIT")},
         {QStringLiteral("WheelXit"),            QStringLiteral("XIT")},
         {QStringLiteral("WheelVolume"),         QStringLiteral("VOL")},
+        {QStringLiteral("WheelSliceAudio"),     QStringLiteral("S.VOL")},
         {QStringLiteral("WheelHeadphoneVolume"),QStringLiteral("H.VOL")},
         {QStringLiteral("WheelAgcT"),           QStringLiteral("AGC-T")},
         {QStringLiteral("WheelApf"),            QStringLiteral("APF")},
@@ -1126,6 +1132,14 @@ void MainWindow::applyFlexControlWheelAction(const QString& actionId, int steps)
 #ifdef HAVE_HIDAPI
         triggerTMate2Overlay(TMate2Overlay::Volume, next);
 #endif
+    } else if (actionId == "WheelSliceAudio") {
+        if (auto* s = activeSlice()) {
+            const float next = std::clamp(s->audioGain() + steps * 2.0f, 0.0f, 100.0f);
+            s->setAudioGain(next);
+#ifdef HAVE_HIDAPI
+            triggerTMate2Overlay(TMate2Overlay::Volume, static_cast<int>(next));
+#endif
+        }
     } else if (actionId == "WheelHeadphoneVolume") {
         const int next = std::clamp(m_radioModel.headphoneGain() + steps * 2, 0, 100);
         if (m_titleBar)
@@ -1213,6 +1227,8 @@ QJsonObject MainWindow::buildControlDevicesSnapshot() const
         case FlexWheelMode::Power:     return QStringLiteral("Power");
         case FlexWheelMode::Rit:       return QStringLiteral("Rit");
         case FlexWheelMode::Xit:       return QStringLiteral("Xit");
+        case FlexWheelMode::SliceAudio:
+            return QStringLiteral("SliceAudio");
         case FlexWheelMode::HeadphoneVolume:
             return QStringLiteral("HeadphoneVolume");
         case FlexWheelMode::AgcT:      return QStringLiteral("AgcT");
diff --git a/src/gui/RadioSetupDialog.cpp b/src/gui/RadioSetupDialog.cpp
index 5470b009..749dc3bc 100644
--- a/src/gui/RadioSetupDialog.cpp
+++ b/src/gui/RadioSetupDialog.cpp
@@ -4194,6 +4194,7 @@ QWidget* RadioSetupDialog::buildSerialTab()
             "ToggleAgc", "VolumeUp", "VolumeDown",
             "WheelFrequency", "WheelVolume", "WheelPower",
             "WheelRit", "WheelXit",
+            "WheelSliceAudio",
             "WheelHeadphoneVolume",
             "WheelAgcT", "WheelApf", "WheelCwSpeed",
             "ClearRit", "ClearXit", "ToggleApf",
@@ -4353,6 +4354,7 @@ QWidget* RadioSetupDialog::buildSerialTab()
             {"WheelRit",            "RIT (Receive Incremental Tuning)"},
             {"WheelXit",            "XIT (Transmit Incremental Tuning)"},
             {"WheelVolume",         "Master Volume"},
+            {"WheelSliceAudio",     "Slice Audio Volume"},
             {"WheelHeadphoneVolume","Headphone Volume"},
             {"WheelAgcT",           "AGC Threshold"},
             {"WheelApf",            "APF Level"},
@@ -4536,6 +4538,7 @@ QWidget* RadioSetupDialog::buildSerialTab()
             {"WheelRit",            "RIT (Receive Incremental Tuning)"},
             {"WheelXit",            "XIT (Transmit Incremental Tuning)"},
             {"WheelVolume",         "Master Volume"},
+            {"WheelSliceAudio",     "Slice Audio Volume"},
             {"WheelHeadphoneVolume","Headphone Volume"},
             {"WheelAgcT",           "AGC Threshold"},
             {"WheelApf",            "APF Level"},
diff --git a/src/models/RadioModel.cpp b/src/models/RadioModel.cpp
index 4ad4f6a7..51cc7cdc 100644
--- a/src/models/RadioModel.cpp
+++ b/src/models/RadioModel.cpp
@@ -4811,8 +4811,13 @@ void RadioModel::handleRadioStatus(const QMap<QString, QString>& kvs)
 void RadioModel::setLineoutGain(int v)
 {
     v = std::clamp(v, 0, 100);
+    if (m_lineoutGain == v) {
+        return;
+    }
+    m_lineoutGain = v;
     qCDebug(lcAudio) << "setLineoutGain:" << v;
     sendCmd(QString("mixer lineout gain %1").arg(v));
+    emit audioOutputChanged();
 }
 
 void RadioModel::setLineoutMute(bool m)
@@ -4824,8 +4829,13 @@ void RadioModel::setLineoutMute(bool m)
 void RadioModel::setHeadphoneGain(int v)
 {
     v = std::clamp(v, 0, 100);
+    if (m_headphoneGain == v) {
+        return;
+    }
+    m_headphoneGain = v;
     qCDebug(lcAudio) << "setHeadphoneGain:" << v;
     sendCmd(QString("mixer headphone gain %1").arg(v));
+    emit audioOutputChanged();
 }
 
 void RadioModel::setHeadphoneMute(bool m)