After reading the discussion about XY touchpad by spectrasymbol, I ordered form them flex sensors samples.
They work for MB64, but maybe some software change is required:
They act as potential dividers, a resistive carbon strip gives resistances from 80Kohm to 160Kohm.
Vin-----------VR1----------Vout
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R2 (not variable) Vout=5*(R2/VR1+R2)
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Ground
Sorry for the poor schematics, but I managed to let a flex sensor work with R2=80Kohm on MB64, but since the output voltage goes from 1,6V to 2,5V I have limited action so only variations from 64 to 30.
Is it possible to change this (to let one flex sensor go from 64 to 0 and another from 64 to 127 to use them as pitch bend) via software or hardware?