The updated Shawzin default controller button bindings that were introduced in The Duviri Paradox update placed the 3 fret controls on the directional pad instead of distinct buttons, which is physically limited to pressing up to 2 adjacent buttons, and makes it impossible to press all 3 buttons or discontiguous buttons. This means that minor chords can't be played using the default bindings anymore.
Here is a Shawzin song memory (that I published in SideAide to teach new Shawzin musicians
Yeah, at first I liked the control scheme parity between PC and consoles, but I didn't think about the fact that you can't press L+R at the same time on a D pad.
What about bringing in the up direction? Leave almost all of the fret bindings the same:
Air -> L
Earth -> D
Water -> R
Air + Earth -> L+D
Earth + Water -> D+R
But replace these two:
Air + Water -> L+U
Air + Earth + Water -> U+R
I guess the UI would be