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Only the H9 and amp are plugged in on an isolated outlet. Using the H9 provided walwart. The amp is fine with any other pedal similarly plugged in.

joecozzi wrote:
That is definitely not normal, but I don’t think it’s the H9. That sounds like USB or GPU ground loop noise. Are you connected to an audio interface or is the amp plugged into an outlet with other audio gear? Look at these videos for reference.