I have a question also. My Undulator works great in all modes except "sine" wave. No matter where I move the other knobs, it won't produce any effect at all in that mode. Single coils and humbuckers used–and as I said, whatever settings I use produce sounds in all other modes (square, ramp, random, etc.). Is there a reason for this? The manual doesn't say anything about it. I have figured out how the undulator works, and how to control it–except for the sine wave mode!