Ok, I've made my ribbon controller, went for the duo-touch configuration. It all seems to work well, but ... (there is always a but) I can't seem to get the maths to work using the patcher.
My Gpio voltages are not linear, as expected, but getting the formula "y=x/(64.1-x)" is hard without any division object and no maths knowledge.
I tried using your demo patch, but that doesn't seem to give any result : the signal after the maths is the same as the one before.
I've managed to get a playable solution using the math/exp function, but it's still quite uneven along the ribbon.
Any idea ?