Both approaches work! Thank you so much! I decided to go with the second option as it seems more robust than marking the import with @preconcurrency and just silencing concurrency warnings.

Ah I see, thanks for the explanation! I've already submitted a bug report via Feedback Assistant a few days ago (FB18933857), but have yet to hear anything back.

Please find attached my crash log. I believe this is the right one. VisualMan-2025-07-17-201213.txt

I accidentally selected this reply as an accepted answer, is it possible to undo this action?

I've made a small breakthrough, the code crashes because of the installTap call, but the bad news is that I'm unable to figure out why. Any ideas?

It's been fixed! All I had to do was mark the loadAudioSamples as @MainActor and wrap the processSamples call in a Task.

Actually, I figured it out! Turns our .m4a encodes to dual mono, so I changed the file format to .wav and I have stereo now!