Shows if a volume is being emulated or not via the tooltip and status bar.

src/AudioIO.cpp

@@ -707,6 +707,11 @@ bool AudioIO::InputMixerWorks()
    return mInputMixerWorks;
 }
 
+bool AudioIO::OutputMixerEmulated()
+{
+   return mEmulateMixerOutputVol;
+}
+
 wxArrayString AudioIO::GetInputSourceNames()
 {
 #if defined(USE_PORTMIXER)

src/AudioIO.h

@@ -198,6 +198,15 @@ class AUDACITY_DLL_API AudioIO {
     * disable the UI if it doesn't work.
     */
    bool InputMixerWorks();
+
+   /** @brief Find out if the output level control is being emulated via software attenuation
+    *
+    * Checks the mEmulateMixerOutputVol variable, which is set up in
+    * AudioIO::HandleDeviceChange(). External classes care, because we want to
+    * modify the UI if it doesn't work.
+    */
+   bool OutputMixerEmulated();
+
    /** \brief Get the list of inputs to the current mixer device
     *
     * Returns an array of strings giving the names of the inputs to the 

src/toolbars/MixerToolBar.cpp

@@ -300,7 +300,7 @@ void MixerToolBar::SetToolTips()
 
    if (mOutputSlider->IsEnabled()) {
       mOutputSlider->SetToolTip(wxString::Format(
-            _("Output Volume: %.2f"), mOutputSliderVolume));
+            _("Output Volume: %.2f%s"), mOutputSliderVolume, gAudioIO->OutputMixerEmulated() ? _(" (emulated)") : wxT("")));
    }
    else {
       mOutputSlider->SetToolTip(