Scott,
My footswitch, which I purchased with the Digitech Vocalist VR, has three switches and measures about 8 inches wide. There are small, rubber feet on each corner that prevent it from moving. You have to physically pick it up in order to move it to another position--you cannot slide it with your feet.

Tonight, I'm headed to the carpet store and picking up a 2X3 piece of plush carpet, and additionally, the thickest carpet pad they sell. A friend of mine who plays in Baltimore tried this about three weeks ago and said he no longer has back pain or sore feet, even after doing a 5-hour stint at the keyboard. I'll let you know if it works for me.

Good Luck,

Gary