The issue is this is a bespoke application for Sherline, they have a proprietary motor speed control that uses a feed from the Masso running VFD. Because they have no need for PWM they chose not to implement it. I have been told if I want to separate the main board from the full size daughter card, solder wires to points on the Masso controller then route those signals out I can probably have PWM, if I do not screw up. If it comes to the point that an external PWM will not work for running gcode that Fusion 360 creates (and I will have to edit the living bejesus out of it) then I am prepared to CNC up my manual DRO mill using BuildBotics or Acorn Controller. I am leaning toward the BuildBotics as it is a clean product having the stepper drivers built into the box rather than requiring a second box like my Masso. That,and like the Masso that it has its own processor so a PC is not required to run and finally that it has status LCD display is really talking to me. I just have to sell this to my better half. The controller, the limit switches, the addition of an NC ready kit will be a major selling job.