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)
- the hover effect makes the lighter color buttons seem to disappear, especially once pressed
- I have no idea what the R button does or why
- pentatonic major is an uncommon scale and odd choice for default - pentatonic minor might be better, or just major