There’s no signal at GiO’s output.

  1. In Apple Menu > System Preferences > Sound or the Audio Preferences of your DAW > Make sure GiO is selected as the Output Device.
  2. If this is a DAW, not System Preferences for basic apps, be sure to check any I/O Setup or Routing areas.
  3. If there is still no output after that go to Applications > Utilities > Audio MIDI Setup, set "Properties For" to GiO, and toggle the sample rate (labeled as Format) from one setting to the other and back.