I'm having a hard time looking at the scale and making sense of it without having to orient myself and think about it a lot. I think this could be fixed with a different visual display, such as less or different colors and more contrast.
I also wasn't sure what effect some of the controls were having, but I think it might be because I am on my phone.
R marks "relative" major/minor, for example: A minor pentatonic is relative to C major pentatonic (contains same notes/shapes, just root note is different).
I can/could change defaults, but, all your presets should be saved between the sessions (your next visit).
I am in the middle of making some interface changes, hopefully buttons will behave better after it.
Thanks for feedback.
I was thinking about tooltips but those are tricky to implement for mobile devices (although I haven't spend much time making it usable for small screens/devices)
I also wasn't sure what effect some of the controls were having, but I think it might be because I am on my phone.