A lot of expression pedals are rather noisy, and as a result we have to wait for a non-infinitesimal change to take place before recognizing it. Otherwise, the values would be flickering around, with audible effects if connected to a preset's parameter.
For this and other reasons, the expression pedal is not the best way to make subtle changes.
If you restrict the range of expression pedal control (changing the MIN/MAX values), this will in effect increase the precision.
Since some people use these pedals with synth control voltages which will be cleaner than an expression pedal, we might want to thing about allowing an optional defeat/reduction of the filtering.
