Matt,
Anytune also has a few in-app purchases available.
I added the midi/bluetooth feature. I think it was $5.
There may have been another to add high quality audio
That's a no brainer.

I've been using it for 3 years now, especially for gigging with backing tracks.
Its pretty solid piece of code.
The developer responds directly to queries, and keeps the feature set focused so its not all things to all people.

For transcribing and rehearsal/gigging, its hard to beat.

biab2024(Mac) Latest Build
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Apple M2 pro 32GB Ram
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