Today, me being me, I did a calculation.
For the 20 button in C/G taking the scale from the note C that is the first finger on the right hand, and going up to the next c, in just one octave there are 128 different fingering patterns for playing the major scale (theoretically, at least).
There are 2 ways of playing the C (the other's on the G left hand, pull)
2 ways of playing the D (the other's on the G row left hand push)
2 ways of playing the E (the other's on the G left hand, pull)
1 way of playing F natural
2 ways of playing G (both right hand push)
2 ways of playing A (both right hand pull)
2 ways of playing B (the other one is G row right hand push)
2 ways of playing the higher c. (The other one is G row right hand pull)
2 x 2 x 2 x 1 x 2 x 2 x 2 x 2 = 128 theoretical routes through the maze. How crazy is this instrument?!
Of course, I don't use them all, although I certainly use all of the right hand options regularly, but wow!