I've got a Stomp that I intend to use as a backup and went to build some sounds on it this week and it had a rather pronounce low frequency hum. The hum seemed to pulse with the TAP TEMPO LED, which I thought was odd, and it got worse it I touched any of the metal connectors on the 1/4 or XLR cables I was using (was going through a direct box and I tried ground-lifting at the DI, didn't change anything).
the cables are all fine, at last iteration of this same setup I had a TONEX One where the stomp goes and it was dead-quiet.
I'll try a few more things (not sure what) when I get some time next week but it was all very strange.
