I just got an EH Humdebugger and thought I would show how it works/sounds. Sound samples with and without below I have a very electrically noisy office/music space. Not sure why. But it's bad enough that I've tried various strategies fro reducing hum. My favorite guitar has a Lace Alumitone in it. But here is an example of a guitar that's annoying to play because of buzz. I made this hollow body out out of plywood. It has a lollar CC pickup that sounds great but buzzes like mad Below are three short and sloppy sound clips, with just a touch of reverb, recorded direct First, without the HumDebugger Second, with the Humdebugger set to "normal" Third, the second clip with a recording of the hum alone mixed in I put the third clip in there to see if the hum itself was adding something, on the theory that we like analog noise. So it's very good, but I do hear a difference between the raw and the debugged sound. I like the raw sound better: it's maybe a little more "lush"? but the hum is infuriating, and the Hum Debugger pretty much kills it. It s clever device that requires its own AC power supply, so I'll bet it works by sampling the line signal and phase canceling the hum?