@phil_m Thank you for the response! Yes, physical pedals.
I only ran the stomp into the amp in this scenario to check if it was my perception being off due to the headphones - it wasn't. I typically will turn off the amp block if I am running into an actual amp- in this scenario the problem no longer persists as stated before. I will try to set the input to line, that is a good idea.
Is there a way to "see" if the input is clipping? I thought that the input dot on the screen would turn red. Also, if the input was clipping wouldn't this happen whether or not the amp block is engaged or not?
I thought about the "amp's" headroom idea. I set the amp block totally clean- dialed back the MV, channel volume, and gain - the same thing still happened.
I will try it with a few other amp models, maybe even some of the pre amp models to, to see if the same thing happens.
Just to be crystal clear. I am not talking about this only happening at high gain settings, this is any gain I throw in front of it. vol. on 1 or 10, no change in perceived volume- in headphones or in front of an amp with the amp block on (again not how I would typically use it).