I have a CNC xPro v3 wired up to control a Super-PID, but have never been able to get the PWM output working for RPM control through OpenBuilds CONTROL. Using CONTROL, if I turn on the spindle I get about 0.045v off of the D11 PWM output. When turned off, it's right at 0v which is spot on. I've tried various levels of spindle RPM using the M3 Sxxxx command, but no change in the output voltage. I'm stumped. Any ideas?