ok cheers, known problem in the way the keys are approximated, which assumes a fixed key width across the keyboard. As the sharp keys differ, it was a trade off against performance to add another set of check loops to verify which key was pressed. I decided to go for slightly less accuracy due to finger use case vs responsiveness.

I plan to overhaul the keyboard algorithms in the third release when I move to a two octave keyboard, maybe using the accelerometer to tilt keyboard left and right etc.