diff --git a/docs/index.html b/docs/index.html
index cd6a1bb04..42426983e 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -1516,6 +1516,12 @@
       <td>Cmd + ]</td>
     </tr>
 
+    <tr>
+      <td>Toggle sound on/off (*)</td>
+      <td>Alt + '</td>
+      <td>Cmd + '</td>
+    </tr>
+
     <tr>
       <td>Switch display format in <i>increasing</i> order (NTSC/PAL/SECAM etc.)</td>
       <td>Control + f</td>
diff --git a/src/common/SoundNull.hxx b/src/common/SoundNull.hxx
index ab0f6fc86..9660e6a59 100644
--- a/src/common/SoundNull.hxx
+++ b/src/common/SoundNull.hxx
@@ -76,6 +76,13 @@ class SoundNull : public Sound
     */
     bool mute(bool state) override { return true; }
 
+    /**
+      Toggles the sound mute state.  While muted no sound is played.
+
+      @return  The previous (old) mute state
+    */
+    bool toggleMute() override { }
+
     /**
       Sets the volume of the sound device to the specified level.  The
       volume is given as a percentage from 0 to 100.  Values outside
diff --git a/src/common/SoundSDL2.cxx b/src/common/SoundSDL2.cxx
index efe2ab254..419b6611a 100644
--- a/src/common/SoundSDL2.cxx
+++ b/src/common/SoundSDL2.cxx
@@ -191,6 +191,26 @@ bool SoundSDL2::mute(bool state)
   return oldstate;
 }
 
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+bool SoundSDL2::toggleMute()
+{
+  bool oldstate = SDL_GetAudioDeviceStatus(myDevice) == SDL_AUDIO_PAUSED;
+  if(myIsInitializedFlag)
+  {
+    string message;
+
+    SDL_PauseAudioDevice(myDevice, oldstate ? 0 : 1);
+
+    message = "Sound ";
+    message += oldstate ? "unmuted" : "muted";
+
+    myOSystem.frameBuffer().showMessage(message);
+  }
+
+  return oldstate;
+}
+
+
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 void SoundSDL2::setVolume(uInt32 percent)
 {
diff --git a/src/common/SoundSDL2.hxx b/src/common/SoundSDL2.hxx
index 5f0c58b4b..47568da5e 100644
--- a/src/common/SoundSDL2.hxx
+++ b/src/common/SoundSDL2.hxx
@@ -79,6 +79,13 @@ class SoundSDL2 : public Sound
     */
     bool mute(bool state) override;
 
+    /**
+      Toggles the sound mute state.  While muted no sound is played.
+
+      @return  The previous (old) mute state
+    */
+    bool toggleMute();
+
     /**
       Sets the volume of the sound device to the specified level.  The
       volume is given as a percentage from 0 to 100.  Values outside
diff --git a/src/emucore/ControllerDetector.cxx b/src/emucore/ControllerDetector.cxx
index a58a59e49..fb8b89ab4 100644
--- a/src/emucore/ControllerDetector.cxx
+++ b/src/emucore/ControllerDetector.cxx
@@ -403,12 +403,13 @@ bool ControllerDetector::isProbablyAtariMouse(const uInt8* image, uInt32 size)
 bool ControllerDetector::isProbablyAmigaMouse(const uInt8* image, uInt32 size)
 {
   // check for Amiga Mouse tables
-  const int NUM_SIGS = 3;
+  const int NUM_SIGS = 4;
   const int SIG_SIZE = 6;
   uInt8 signature[NUM_SIGS][SIG_SIZE] = {
     { 0b1100, 0b1000, 0b0100, 0b0000, 0b1101, 0b1001/*, 0b0101, 0b0001*/ }, // NextTrackTbl (T. Jentzsch)
     { 0x00, 0x88, 0x07, 0x01, 0x08, 0x00/*, 0x7f, 0x07*/ }, // .MovementTab_1 (Omegamatrix, SMX7)
     { 0x00, 0x82, 0x01, 0x03, 0x02, 0x00 }, // .MovementTab_1 (Omegamatrix)
+    { 0b100, 0b000, 0b000, 0b000, 0b101, 0b001} // NextTrackTbl (T. Jentzsch, MCTB)
   }; // all pattern checked, only Amiga Mouse matches
 
   for(uInt32 i = 0; i < NUM_SIGS; ++i)
diff --git a/src/emucore/Event.hxx b/src/emucore/Event.hxx
index a7284be75..784c93c94 100644
--- a/src/emucore/Event.hxx
+++ b/src/emucore/Event.hxx
@@ -74,7 +74,7 @@ class Event
 
       ChangeState, LoadState, SaveState, TakeSnapshot, Quit,
       PauseMode, OptionsMenuMode, CmdMenuMode, TimeMachineMode, DebuggerMode, LauncherMode,
-      Fry, VolumeDecrease, VolumeIncrease,
+      Fry, VolumeDecrease, VolumeIncrease, SoundToggle,
 
       UIUp, UIDown, UILeft, UIRight, UIHome, UIEnd, UIPgUp, UIPgDown,
       UISelect, UINavPrev, UINavNext, UIOK, UICancel, UIPrevDir,
diff --git a/src/emucore/EventHandler.cxx b/src/emucore/EventHandler.cxx
index fb3c48106..edc6ec7a2 100644
--- a/src/emucore/EventHandler.cxx
+++ b/src/emucore/EventHandler.cxx
@@ -373,6 +373,10 @@ void EventHandler::handleEvent(Event::Type event, Int32 state)
       if(state) myOSystem.sound().adjustVolume(+1);
       return;
 
+    case Event::SoundToggle:
+      if(state) myOSystem.sound().toggleMute();
+      return;
+
     case Event::SaveState:
       if(state) myOSystem.state().saveState();
       return;
@@ -1261,6 +1265,7 @@ EventHandler::ActionList EventHandler::ourEmulActionList[kEmulActionListSize] =
   { Event::Fry,                    "Fry cartridge",            "", false },
   { Event::VolumeDecrease,         "Decrease volume",          "", false },
   { Event::VolumeIncrease,         "Increase volume",          "", false },
+  { Event::SoundToggle,            "Toggle sound",             "", false },
   { Event::PauseMode,              "Pause",                    "", false },
   { Event::OptionsMenuMode,        "Enter options menu UI",    "", false },
   { Event::CmdMenuMode,            "Toggle command menu UI",   "", false },
diff --git a/src/emucore/EventHandler.hxx b/src/emucore/EventHandler.hxx
index 8fa9f01dc..5d6e86234 100644
--- a/src/emucore/EventHandler.hxx
+++ b/src/emucore/EventHandler.hxx
@@ -363,7 +363,7 @@ class EventHandler
     enum {
       kComboSize          = 16,
       kEventsPerCombo     = 8,
-      kEmulActionListSize = 80 + kComboSize,
+      kEmulActionListSize = 81 + kComboSize,
       kMenuActionListSize = 14
     };
 
diff --git a/src/emucore/Sound.hxx b/src/emucore/Sound.hxx
index 086986f63..8f892a2db 100644
--- a/src/emucore/Sound.hxx
+++ b/src/emucore/Sound.hxx
@@ -69,6 +69,13 @@ class Sound
     */
     virtual bool mute(bool state) = 0;
 
+    /**
+      Toggles the sound mute state.  While muted no sound is played.
+
+      @return  The previous (old) mute state
+    */
+    virtual bool toggleMute() = 0;
+
     /**
       Sets the volume of the sound device to the specified level.  The
       volume is given as a percentage from 0 to 100.  Values outside