It took me about 5 minutes to understand what this is doing.
For anyone else confused, it doesn't listen to you play, it just logs your use of the metronome and provides tabs.
IMO the app would be cooler if it was simply the metronome app on a page. And if you want to track which song you are working on, then just add the ability to label a session. Could have a different mode for people who want it over videos, but usually when I'm practicing, I know the tab and am not watching a video while I practice.
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