Gecko servo tuning and variable encoder resolution / Mach1

I was considering using a Gecko 310 with Mach1's step and direction
spindle drive with the existing servo amp to control my 4hp spindle
for rigid taping and whatnot. I was also considering the ability to
index my spindle rotation for 5-axis (don't ask). The applications
require vastly different pulses per revolutions (cpr). USDIGITAL
sells a EDIVIDE for $39 that lets you electronically divide encoder
pulses by arbitrary factors which allows mutilpe resolutions from one
encoder.

My question (knew I would get there...) is a Gecko's tuning (gain and
damping) dependent or independent of the encoders resolution? My
suspicion is that it is depednet as gain is probably related to
encoder resolution.

Any opinion?

Roger