There is something wrong with your setup. Not working for PG Music nor for Apple, I can't screen share to see what it is. I do notice that you state you're running over macOS 15.6.1. The current version of Sequoia is 15.7.7 and a whole lot of bugs have been squashed in the mean time.

You have allowed BIAB access to the Microphone in System Settings > Privacy & Security > Microphone, right? If you haven't, this explains the problem. All audio apps must allow this. When you double-click on an m4a file, it's the System that's playing back the audio, not BIAB.

I have a Sequoia test Volume. Hooking up my 2023 BIAB Audiophile drive, my results were identical to my earlier Tahoe test: Everything works and auditioning Styles through the StylePicker resulted in the audio playing back as it should.

I then connected the drive to my new M5 Air running Tahoe and got the same results—everything fine.

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BIAB 2026 Audiophile Mac
24Core/60CoreGPU M2 MacStudioUltra/8TB/192GB Sequoia/Tahoe, M1 & M5 MBAir, 2012 MBP
Digital Performer11, Logic, Finale27/Dorico/Encore/SmartScore/Notion/Overture