Don't know diddly about this except that there's some pretty good feedback on the reddit thread below. The headline of the thread says

"I created an open source macOS virtual audio driver that allows applications to pass audio to other applications with zero latency."

It's called "BlackHole."

Don't have time to try, but maybe some of you do. ;-)

https://www.reddit.com/r/audio...

Best Wishes,
Mark