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Shush uses the CoreAudio API to toggle the mute state of microphones.  Unfortunately, not every device can be muted.  To see if your device is unmutable, launch Audio MIDI Setup in your /Applications/Utilities folder.

  1. Select your device from the list on the left.
  2. Click the Input tab.
  3. See if you can toggle the Mute checkbox on the M (master) channel, or failing that, the checkbox on each of the # channels.

If you can't mute the device, then unfortunately Shush can't either.

List of Known Unmutable Devices

  • Apogee ONE
  • Apogee MIC 96k
  • Avid Mbox Mini
  • FiiO USB DAC-E10
  • Focusrite Scarlett 2i2 USB interface
  • Jabra Pro 9470
  • Logitech H800
  • Mackie Onyx Satellite Firewire
  • Plantronics BT300M
  • Samson G Track
  • Shure PG42 USB
  • Shure X2U
  • Zoom H1

Please let us know if you find another one.