I use jack under Linux, but I think it's difficult to get that working on a mac.
I've heard from @tedthetrumpet that blackhole works well: https://github.com/ExistentialAudio/BlackHole
Here's the userbase page:
https://tidalcycles.org/index.php/Separate_audio_outputs
Here's a nice video about it:
https://www.youtube.com/watch?v=W6ZJVHUpTRA