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Capturing this here because it’s so bizarre to do this in 2022.
OSX Monterey, OBS running to record a running Altirra session (run via Crossover) and audio sounds like mud.
It sounds that way because it’s the mic on the display that is picking up the audio from the speakers… How can OBS pick up the direct audio from Altirra and just record it as part of the stream/file? Well…
Install the open source tool blackhole:
$ brew install blackhole-2ch
Run Midi Setup, create a new aggregate device – set the direct-line output (speakers)
Set Sound Prefs to use that as Output
In OBS choose blackhole2 as the source for the Audio Capture
Now you can record audio from Altirra in OBS and also just hear normal things you run on the Mac.
This was discussed here: https://obsproject.com/forum/resources/mac-desktop-audio-using-blackhole.1191/