PieterP:
Your potentiometers are probably logarithmic ones (Audio). MIDI controllers use linear potentiometers, for obvious reasons.
You can do the correction in software, using Analog::map(int(*fn)(int)), you just need two linear approximations of the log taper, as shown in the image above, to reverse the effect. Take a look at the map example: MIDI_controller/examples/Ex.08.Potentiometer-Calibrate/Ex.08.Potentiometer-Calibrate.ino at master · tttapa/MIDI_controller · GitHub
I have no idea what kind impact this will have on the noise, though.
thanks there are linear pots,,
so the potentiometer are going but if i add the fader its say to me :
warning: array subscript is above array bounds
thanks