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Been sub'd to the channel for a few weeks now and discovered it through YouTube. Cool to come across it on another platform! Great presentation and love the videos, thanks for the insights!

Appreciate the advice everyone. Did some further testing tonight with a couple amps and the buzz is present utilizing the 4 CM. While testing, I put a Bleat Chop Trem block in the effects loop path and it has a tremendous effect on the signal while humbucker equipped guitars are plugged in or while the cable is unplugged in the guitar end. I could increase the tremolo effected hum sound while utilizing the amps gain and channel volumes but not with a master volume. Putting a noise effect in the effects loop path would effect the hum and not while in the front of amp channel. Touching the tip of the cable plugged into "Guitar IN" caused a massive volume boost that was modulated by the tremolo. Is this indicative of a ground loop issue or a AC power issue? I first thought it was a problem with the Line 6 Helix but now I'm not sure! I plan to get the Behringer Hum Destroyer when it's in stock. I'm contemplating getting a power conditioner like the Furman PST-6 or even the Furman PST-8 if necessary. I live in an apartment and can't say much about the wiring. Any help is appreciated and I'd be glad to follow any diagnostic steps - thank you!

Thanks for input. I'm really consider the Behringer Hum Destroyer. If I were to go EBTech can anyone advise if the Hum X or Hum Eliminator would be a better option (high gain amps utilizing 4CM)? Thanks Edit: if adding the Helix noise gate block (-35db or so) into the effects loop chain solved the noise issue am I headed in the right or wrong path looking at the Ebtech and Behringer?

At wits end. I have the Helix LT and love it; it's amazing piece of hardware and I recommend it to everyone. I bought it with the intention of using the amp modeling with headphones while my fiance works at home and for recording. I knew that eventually i'd try to incorporate it into some of my amps with the four cable method to get the preamp growl with my favorite speakers. Unfortunately, with both amps, I'm getting miserable hum - Sunn Beta Lead (ss) and Orange OR15 (tube). I've tried multiple guitars, multiple cables, and different electrical outlets. I've ensured the amp and Helix are sharing the same power strip (EMI filtering) and have tried two different power strips. My signal goes guitar -> Helix LT (processor chain one) -> Amp Preamp -> Amp Effects Loop Send -> Helix LT (modulation, processor chain two ) and 1/4 output -> Amp return. The only thing that helps is to put a Noise Gate block into the effects chain within the Helix and set it to about -35db. However, when I strum a chord, the hum is present with the guitar and it's sounding crap. If I try the noise gate in the signal between guitar and Amp preamp no hum reduction occurs. I'm considering the EBTech Humx ($80) or Behringer MicroHD HD400 Ultra-Compact 2-Channel Hum Destroyer ($35) based from other threads. Line 6 Community - based on my experience of hum within the effects loop of multiple amps and it being only tamed by a Noise Gate block - any recommendations? I'm only playing at home and want to be cost efficient. Thanks guys!