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Hello Friends! This is not your typical "amp fizz" "squirrels" "Ghost in the machine" thread! I suspect there are several things at play here. First, the backstory. I've been having "fizz" troubles with my Helix for months, at their worst they result in massive volume dumps during live performances thru my (Matrix GT800) live rig. BUT recently its almost like they decay over time... I wouldn't be starting this topic if not for the fact that for the last 8 hours STRAIGHT it sounded amazing. Low end was tight, everything sounded amazing. I play through my headphone exclusively but when the fizz gets bad I make sure to diagnose, record it thru the USB, track it out the 1/4" in ouputs and even the sends. BUT THEN I opted to try to restore some old Factory Presets by loading old Firmware into the Helix. Well, I jumped to 3.01 and the fizz came back and hasn't left yet. I'm on my second round loading the firmware through the Helix from 3.01 -> 3.11 Hoping it helps. Attached are 3 stock Helix presets, not affected at all beyond making the impedance 1M. THEY CAN'T POSSIBLY BE THIS BAD YOU GUYS WHATS GOING ON. Jazz Rivet - 04A.mp3 WOrks just fine - 09A.mp3 SadSad - 01D.mp3