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

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