A few notes and observations from a quick trial run below:
- the app crashed out a few times when connecting to my MIDI controller (a Yamaha MD-BT01 dongle that plugs into the old school MIDI plugs on the keyboard). Not sure what's going on there, but it happened a few times. - the feedback given seemed quite helpful, I like that wrong notes were highlighted, and it seemed to do well at ignoring a false-start that I made while trying it out. - I would have liked if the playback functionality supported MIDI too; I play with headphones on and it's a bit weird (and annoying for other people in the house) if the playback comes out of the iPad. - I would also like the ability to start from a bar of my choice and maybe even evaluate a one or two bar section at a time rather than having to play the whole piece
On the whole though I think it's a good app, and I intend to use it more. I don't share the concerns of others about the price of the sheet music, I think your pricing is reasonable, and assume it takes some effort for you to translate into a form that can be used.
Well done, thanks for sharing.