AudioMidi.app / Music.app drift sync

When I connect my MacBook to my living room AirPort (older gen wallwart) via Music app, the music output in both rooms is synced.

When I try to setup a Multi-Output Device in AudioMidi setup, I'm not able to get them synced. I'm outputting to the same devices, they're all on the same sample rate, and I've played with the various settings (Primary Clock Source and Drift Sync). What gives? How are these connections different?

Intel MacBook Pro 2018 running Sonoma 14.5

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AudioMidi.app / Music.app drift sync
 
 
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