I've read a couple of reports that people with Merging DACs are able to get more than six channels. I can't confirm it myself, though. I have a Digiface USB, which supports up to 32 channels out, and it doesn't work at all for surround anymore from Music in 12.3.1. Stereo only. Surround still works in the TV app up to 5.1, in Monterey, and in Music works up to 5.1 under Big Sur. Aggregate devices seem broken for all surround for Music in 12.3.1, as well.
wisechoice
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