knoll said:What do you have in the signal chain after amp model? I think delay block can clip internally. And cab can add distortion if distortion is dialed in. But i guess you don't have cab clock because you go into guitar amp.
The only way that boosting the Level control could increase distortion is if there is a post-Amp-Block FX Block that is being overdriven. If that's not the case, and if we're all correctly grokking the OP's problem, then there is something wrong with his unit.
As for me, I rarely use the Layout Page's mixer for this.
I use the level parameter in the amp block itself.
To the OP:
Do you get the same problem when you use the Amp Block's Level parameter?