Hi, I would like to have your opinion on a strange noise coming from my setup : I'm using the 4CM with my Helix and my Engl Ironball head following the standard procedure : https://goo.gl/images/7CrDsD On my Engl clean channel, the sound is ok without any buzz or parasites. Problems happens when I switch on the lead channel and get awful numeric sounds (Which you could hear right here : https://youtu.be/l-dEdm9L2IM). I've run other tests to try to find the guilty : running a boss delay on the fx loop of my Engl on Lead doesn't produce any parasites, running the helix with the 4CM on a tubeless combo amp (peavey bandit) lead channel doesn't produce any parasites whatsoever. What would you think ? Inevitable DA/AD parasites sound coming from Helix amplify on high gain tube amp ? Thanks !