No analog voltage doesn't change no matter what I set the speed at.
My settings are as follows. Spindle page PWM Freq-1000 PWM min duty- 0 PWM Max-100 M3 relay pin 2 port 1 spindle velocity min-18000 spindle velocity max- 24000 both pwn spindle and spindle relay output enabled are checked. I/O setup page only thing I have done is Spindle PWM -> analog ch. 1