I've noticed that on many built-in and some custom presets I get something that sounds like Automatic Gain Control on those old cheap casette players/recorders. Essentially, start with factory preset 10C, then 1) with complete silence on the input, 2) very gently strum a chord 3) then strum hard. Sound level is roughly the same in 1 and 2 and there is a distinct 100-300ms on 3 where level gets "controlled" effectivelly dropping volume.
With digital effects and limited dynamic range, it stands to reason you would have some sort of protection from overrange errors / clicks and pops that would result. But I don't think this was done well on Helix - and I don't think AGC is an answer at all (if that's what's happening).
So the questions - have you guys noticed this? Is there a better explanation of what I'm hearing? Any suggestions on how to overcome this (other then the obvious - e.g. edit all presets to manually manage volume on every stage in the chain to stay clear of AGC)...