once you have a virtual audio interface installed, you can use the built in audio/midi editor, create an aggregate device, and use that from inside QuickTime.
it's not super straightforward to set up, but once you have it set up, you can route audio anywhere and record that easily with QuickTime.
using an extension for virtual audio, for a system designed for routing audio isn't really a "hack", and I'm kind of surprised that with the audio routing already available in macOS that it doesn't ship with a virtual audio device out of the box.
the worst part is that most Mac owners don't know about "Audio MIDI Setup.app"
Again, I know it’s possible and I’m writing this to express my wish that it wasn’t necessary. Installing kernel extensions and keeping “Soundflower 8ch, Soundflower 16ch” permanently in my audio output lists is a compromise and a hack.
once you have a virtual audio interface installed, you can use the built in audio/midi editor, create an aggregate device, and use that from inside QuickTime.
it's not super straightforward to set up, but once you have it set up, you can route audio anywhere and record that easily with QuickTime.
using an extension for virtual audio, for a system designed for routing audio isn't really a "hack", and I'm kind of surprised that with the audio routing already available in macOS that it doesn't ship with a virtual audio device out of the box.
the worst part is that most Mac owners don't know about "Audio MIDI Setup.app"