[SethMurphy]

Recording and watching or listening to myself play has been very helpful for me. Even a temporary recording of just the current session, or most recent n minutes/beats would be nice. It's hard to evaluate execution in real time while performing it. To get it right as a user experience is not a simple task though. However, your great minimal feature set could also be seen as a plus to drive the practice routine efficiently no matter the quality, you'll get better too.

[naiquevin]

Agree about recording and listening to it. I also do it sometimes. My concern about implementing the record/playback functionality is that it may introduce a bunch of complexity considering it's a web app (permissions to record mic, browser compatibility etc, limits on local storage etc.).