@ybr RE: the two-octave comment.
Have to be careful about our lingo here.
I was referring to having the pitch bend be two octaves, defined by your softsynth’s patch.
I was referring the the layout having 13 notes, referring to having a range of one full octave from left to right on the layout.
You can’t achieve an intended slide of any octaves without a full octave being present on the layout.
All of that said, I might have to make a 13-note layout.
BTW excellent job on sourcing the materials and getting a prototype going. Very ambitious, and it looks great!