This is the reason I am not buying a Helix and moving away from Line 6 gear.
It sucks that your volume goes down by itself. But my volume goes up by itself. and trust me that is worse!! I would rather have tones cutting to silence, than boosting to speaker blowing levels by themselves.
The problem as you may have already found by now... is that the potentiometers at the top (DRIVE, BASS, MID, TREBLE, PRESENCE, VOLUME) are CHEAP CRAP.
After a couple of years, these are going. Now they are over sensitive, the slightest movement, or none, and they change themselves, in some cases from 50% to 70%. A small change with some amps, and a jump from normal to deafening with some metal amps.
Of course, Line 6 has a short term warranty and won't do anything about this. Especially here in Indonesia. So I am left with a $550 pedal that made it a couple of years before becoming next to useless.
My option as someone described above is to set the volumes in the software, and not change anything live. Which is next to completely f*cking useless. Anyone can guess what my resale value is now? that's right...diddly squat.
Line 6 never wrote a stable driver for windows 10 and their follow up for HD500X seemed to drop off shortly after release.
Always onto the next thing, rarely fixing bugs and issues.
My experience of Line 6 overall went from great to very dissapointing with the HD series... and now Helix Native alone is $400 freakin dollars with no crossgrade options for HD users so I can't even get that. I can't even afford it after selling my 500x for pittence.
Seriously dissapointed customer.