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^^ I can't say. I think its only use is to increase the signal. Try grounding some wire cable from one device to other and move the bare end from one device to the other it may isolate the hum as I tried it before.

^^ Nick, that's about how I started to looking into this, (ground-loop hum) issue last year. I must have looked at dozen of videos for demonstrations and settled on the one I'm using which is okay. There are others that are XLR/TRS balanced that have similar transformer to rid the humming/Gremlin.

I have several Behringer HD400 Hum Destroyer, that has eliminated some hums and often rare buzz/hum effectively.