SDLK_Pause to toggle "mute"

stepmania/src/StepMania.cpp

@@ -1352,6 +1352,15 @@ bool HandleGlobalInputs( DeviceInput DeviceI, InputEventType type, GameInput Gam
 		}
 	}
 
+	if(DeviceI == DeviceInput(DEVICE_KEYBOARD, SDLK_PAUSE))
+	{
+		static bool bMute = false;
+		bMute = !bMute;
+		SOUNDMAN->SetPrefs( bMute ? 0 : PREFSMAN->m_fSoundVolume );
+		SCREENMAN->SystemMessage( bMute ? "Mute on" : "Mute off" );
+		return true;
+	}
+
 	return false;
 }