Bill,
For under $2 you can purchase some stick-on soft rubber nubs at Radio Shack. They're like a small rubber ball that has been sliced in half and has adhesive on one side. Put one on each corner of the pedal and it will not move on tile, carpeting or concrete. Been using them for years.
Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)