Perhaps, but the number of chords available using single finger is very limited...major, sevenths, minor, minor7th...not a lot to go on.

I had a buddy that used a midi accordion with a Roland RA-90 and he didn't have it set for single finger...he was playing augmented, major 7th, minor 7th flat 5's...even the occasional demolished chord ...so it couldn't have been single finger.

I thought a midi guitar sent chord information from the 6 strings...I can't see how single finger would work, unless the guitarist was using bass pedals, and that would again limit it to only major, 7th, minor, minor7th.

Ian