If I use 10x 500k potentiometers instead of 10x 10k potentiometers, will it have any effect on the control range of parameters in Axoloti? ie will some of the values be "unreachable" if I change the resistance of the pots by such a large amount?
The input impedance on the analog inputs is fairly low, (under 50k ohms), so I'd expect using pots with a high value will probably affect the linearity of the measurments, but not the range.
I'd try it, and see what happens.
Also take in account that with high value pots the current flowing into Axoloti will be very low and you may have problems with noise and erratic readings...