I'm quite familiar with the music theory behind all of the scales, having played instruments for over 30 years, but I'm not finding the information display or interface to be very intuitive.
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)