I'm no fan of modeling amps for a variety of reasons, and don't use them, but there are some that sound better than others.Hmm. That is interesting. I wonder if that may be what is going on here. The amp is a great amp for noodling around the house and built well. But it sounds....sterile....in comparison side by side to my old amps. Like there is no character of its own, no soul if that makes sense.
It sounds great for modern day rock and metal stuff in my opinion as it is so...dry and takes extreme levels of dirt and pedals well. But for my main stuff i like to play, its just...dead sounding. Maybe over processed and everything (especially the highs) are just too crystal clear to the point of being obnoxious.
Maybe all the adjusting and tone chasing ive been doing is just the amp and not the guitars fault at this point.
The unpleasant brightness might just be due to the design of that modeler. If your tube amps sound better (of COURSE they do! ) there are reasons:
A lot has to do with the qualities of the A/D and D/A converters used in that amp, the design and quality of the parts, and a million other variables one can only guess at.