I have a Bernina 440 QE with a BSR, but I never use it. I found that I can set the speed control where I want it, and no matter how hard I press the foot pedal, the speed stays the same. Then, it's just a matter of moving my hands smoothly and steadily. Since my problem was always coordinating my foot and hands (I found out a long time ago that I would never be a drummer or an organist), using the speed control feature eliminates that problem.