[KenWittlief]

presently you need to create a closed loop feedback control system to have your commands correspond to 'speed' instead of torque.

Im not sure closing the bridge would really map directly to speed- it sounds too easy to be true :^)

an out-of-the-box motor 'speed' controller from Victor would be super. I think it would have to measure the back emf and close the loop on itself.