I’ve cracked the code on what turned out to be a fairly complicated setup - documenting it here in case it helps anyone else out. With this setup, the leader has one mix, and a second mix with leader mic and audio sources, plus all computer audio is routed to Flock. All this is combined with Flock singers’ voices to route to Zoom. Boom!
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AUDIO MIDI SETUP (located in Application>Utilities): set speaker configuration to Virtual 1 + 2
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CONSOLE: run your mic (I use a mixer into the Apollo because I need more channels than my Apollo has) in Channel 1 (or 1 + 2) and Computer sounds route through Virtual 1 + 2. These will be your monitor mix. Route both channels through Aux 1, but make sure to mute Aux 1 in your monitor mix.
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FLOCK: choose Universal Audio as Input and Output. In Settings>Audio, choose Aux 1 L + R for Active Input Channels. Choose MON L + R for Active Output Channels
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LOOPBACK: create TWO instances of Universal Audio in Sources. In the second one, route Outputs 3 + 4 to Output Channels 1 + 2, then delete the first instance.
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ZOOM: Choose Universal Audio as Speaker, and Flock to Zoom as Microphone
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DAW: to play music through a DAW (I’m using Logic) choose Output 5/5 (aka Virtual 1 + 20 in your I/O assignments.
