Really great - played first lesson. Second lesson crashed on https://getinstinct.com/courses/intro-to-guitar/amazing-grac... before I could play along with the review of part-1.

Would like regular music notation as I already know that. Also it's a bit quiet, would love to have a voice guide rather than just reading the prompts.

One slight problem is that on parts where the section to play starts on the same note as the end, and uses an open string, the sustained note of the string automatically skips the first note of the repeat playthrough. Perhaps the algo needs to look for an amplitude peak at the start of the students playthrough to avoid this?

Incidentally the tuner is better than any of the simple tuners I've used on Android, haven't tried it on my phone however. It coped with my children talking over it and still helped me tune very quickly.