I'm looking for a way to create an aggregated audio device with a specific configuration, but not sure how to map them.

I've got a headset, iRig, garage band and other app.

Essentially I want to create this setup:

iRid input -> garage band -> mix -> headset output
                   |          ^
                   v          |
headset mic  ->   mix  -> other app

I expected I could map this to basically 2 aggregate audio devices with one of them:

"Mix for app":

  • add headset mic as device's input - possible
  • set garageband output to this - possible
  • set app's input - not possible :(

I believe I could do this with the blackhole app, but it requires quite a bit of work to get more than 1 blackhole working at a time.

Apart from spending money on Loopback, what are my options here? Am I missing some possible configurations?

  • Have you experimented with the macOS native Audio MIDI Setup app?
    – IconDaemon
    Feb 23, 2021 at 12:31
  • Yes, as described, the aggregate audio device can't be used as an input in the app (zoom in this case)
    – viraptor
    Feb 23, 2021 at 12:33
  • OK. You didn't mention you'd tried Audio MIDI Setup. Perhaps you should edit your question for increased specificity. Perhaps Audio Hijack might help?
    – IconDaemon
    Feb 23, 2021 at 12:44
  • You can use aggregate for multiple I/o but not for inter-app comms. For that you’ll need BlackHole (which I’ve never tried) or Rogue Amoeba’s Loopback.
    – Tetsujin
    Feb 23, 2021 at 12:57


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