While not ideal, but you can use the MIDI protocol that is supported over the Camera Connection Kit for lightning ports, or with a regular USB-C cable for USB-C ports.
While the MIDI protocol is pretty old it supports sending data in MIDI System Exclusive messages. It should work just fine for any type of devices, not just musical instruments.
rmridev
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@benwiggy This was the only way I could reliably start and stop audio feedback.
viewWillDisappear is not called immediately when you navigate away from your file, it looks like the OS keeps 2-3 preview controllers active as you navigate between files.
Here's the workaround that seem to work on Ventura:
https://stackoverflow.com/a/76433758/1182910