1. On a Mac, ensure that the sample rate in the Audio MIDI setup is set to 44.1 or 48 KHz. You may have to do this every time your iD22 is disconnected from your Mac. The same goes for the Windows sample rate settings.
2. Open the iD mixer and ensure that, on the right side of 'master mix', the 'opt' option is selected and not greyed out. This will bring up the channels Digital 1 and 2 on the Audient mixer.
3. In the iD application go to View > System Panel and ensure that the S/PDIF options are selected for Digital In and Out on the left-hand side, and that the preferred clock source is set to DIG 1.
4. Make sure your TV has optical out (obviously!) and enter the TV's sound settings to change the speaker output to 'external speakers' or 'sound system' or 'audio system' - whatever is specific to your TV. Ensure the sound is not playing out of the TV's speakers as this indicates you haven't adjusted the audio settings correctly.
5. In the iD mixer, bring up the fader levels to 0 dB for the Digital 1 and 2 channels (this is where the audio from your TV comes from).
6. You should now be able to hear audio from your TV via your iD22!
Note: This will only work correctly when the iD22 is connected to a computer. It cannot work in standalone mode.