Spectrasymbol Flex sensors

[SounDuke]

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

                            |

                            |

                            R2 (not variable)              Vout=5*(R2/VR1+R2)

                              |

                              |

                          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?