I’ve wondered this for years, about why some models sound fantastic and respond just like my real amps and yet others are miles off.
Turns out one huge factor that I didn’t realise is some amps in Amplitube need a MASSIVE gain boost compared to others.
I’m talking about upwards of 15dB on a signal that is just tickling 0dBFS. Even then it sounds undergained compared to the real amp, but some amps sound much more like their real counterpart at this point and have a much more useful and sensible preamp gain taper.
I made a video to demonstrate what I mean, there are many other amps models that exhibit this problem.
https://youtu.be/IRBLJobxNCY