I have mostly play a Mark IV and I can get it to sound basically identical to my real Mark IV but the rectifier models sounds so buzzy and tubby. I have a dual and a triple rectifier so I know that they have the quality to them but the real amps I can dial to sound decent but I can't do anything with the models in the Axe Fx. On the real amp I put a parametric eq before the amp set at 90hz and remove some low end but when I try to do that in the Axe I can't get anywhere near it. I can't get it to sound remotely like the real amp. Any one use them and have any feedback? Maybe I am missing something?