As we know, Mark IV Lead channel was modeled with the Presence PUSHED, but the classic IIC+/III poweramp response is when the Presence is PULLED.
Luckily we already have a Mark IV poweramp model that has the Presence Pulled, it's the Rhythm 1 model, all we need is to be able to route the Lead Preamp into the Rhythm 1 Poweramp, that's how your get proper Metallica and Petrucci IIC+ tones.
Graphs of Presence behavior difference between Rhythm 1 (Pulled) and Lead (Pushed) channels.
You'll quickly notice why 99% of Mark IV players prefer the Presence Pulled for the original IIC+/III response.
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This post is an addendum to these posts:
I certainly won’t ever complain on Line 6 about it. Putting profiling in something like the stomp may very well be an excellent idea in todays market… but I wouldn’t ever use it or ever want to. Maybe just me… But yeah, because of this I don't really get the current love affair with the ToneX...
thegearforum.com
I don't do that either because I've switched that option off. Still leaves other capacitive options intact, for whatever weird reasons. When I first got the stomp I accidently hit the capacitance switches all the time but must have gotten used to it cause I never do that now.
thegearforum.com
PS.
I love my Helix, but sometimes it pains me to know that a model could have been much better if Line 6 made a different decision regarding settings when modeling the amp.
To say this one more time, separate Poweramp models will open a world of new tones.