How do you mean ratios?
My spindle is set to run at 6,000 RPM which gives 12,000 pulses. I tried to set the pulley #1 ratio at 2, but the RPM stayed the same in the display (12,000). There is a box in the spindle calibration pop-up that says "pulses per revolution", but it is grayed out and I can't enter the number two there.
How else would you do this?