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Oh boy, the hum is out of control on my H90, making it unusable. I’m simply running In 1 and Out 1 to the FX Send and Return of my Mezzabarba Skill 30 combo.  Other delay units I’ve plugged into the FX Loop (Boss Space Echo, Earthquaker Avalanche Run) are quiet as a mouse. It’s just the H90, which is causing all kinds of problems. I’ve not used the unit at all since purchasing it brand new, and was saving it for recording and it’s now probably out of warranty. I do suspect that it’s some sort of setting in the unit, as pressing the ‘Parameters’ button gets rid of it.  I’m not much of a gear tweaker and was counting on the H90 Control to save some patches both for live use and recording. I’m posting this as a last resort to see if I can salvage anything from this unit.  I just did the latest firmware update too.  Any help would be greatly appreciated as I was really looking forward to getting creative. Thank you.