CV 9 EMF Frequency
Adjusts the pulse rate frequency for finer motor control. This value also effects the minimum speed.

CV50, Bit 0, Back EMF Control
If set back emf control is active.
0 = BEMF is Off, 1 = BEMF is On.

CV50, Bit 3, Motor Drive Selection
0 = Precision Glide Control,  1 = Silent Drive.