One more idea. For diatonic presets, it would be cool to be able to chose two scales. One as the default and the other as the fallback scale when I play notes outside of the default scale.
For example, let's say that I'm playing a song that's mostly in G but modulates to D# occasionally.
That way I could set G Major as the default scale but as soon as I play notes outside of G, like D#, I could make the PF harmonize with those notes from the G Phrygian scale (or D# major).
This could be useful even in cases where there's no modulation. Sometimes playing outside of the most obvious scale is more interesting and having control over what notes the PF picks to harmonize against those, would be powerful.
