New, Unused Wampler Pedals Ego Compressor I never used it after purchasing it! It's a new, unused item. You can get a decent sound whether you set the Sustain and Attack knobs to 0, 12 o'clock, or full. Adjusting the knob positions is very delicate, so the controls might be a little difficult to use for those who can't imagine the sound of a compressor, but once you get used to it, you can have a lot of fun creating sounds. Also, it has good measures against mechanical noise from the switches and pots.