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From the images and description on the app's Play Store page [0], the skill level is manually set.

[0] https://play.google.com/store/apps/details?id=dev.lorendb.mu...

This is indeed correct. I want to eventually implement a feature that will say "you've played this daily for the last 10 days, have you progressed?" but currently you have to manually specify how good you are at the song.

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