Also posted the issue in the pico 8 pak github. Not sure which side the issue sits!
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For some reason bluetooth audio isn't working on NextUI.
All other emulators transmit sound just fine (SFC, GB, GBA, PS, MD, NES), although some (GBA, NES) have the same issue of no sound at all if I set the output to 48khz instead of 44.1.
FYI headphones being used is airpods pro 3 and NextUI is v6.9.3, running on a Trimui Brick Hammer.
Hope this is a quick fix! Love your work