Some foot controls are better than others. If it's an inexpensive machine, you probably don't have control of it. If you wanted to get inside the foot control, you may find a "potentiometer" to adjust. If the foot control says, "Electronic" on the top, it's got an adjustment inside. If it's the white metal thing, they're harder to adjust. Just don't touch anything inside while it's plugged in. :-) If it's got the small round post type foot control, take it back to where you got it and ask if they can adjust it for you.