I find it unbelievable that in 2018 this is still one of the best amp simulators. I have so many issues with the artificial high tones of the other sims that I mostly use the Emissary with some good Demon/V30 IRs. I use a standard TS boost and I set the lead gain on Emissary between 2-3.
@Axehead666, the amp is totally free - so you should have no problems with it. Try using other free cab impulses, like the God's Cab Pack (its a really good collection). I used theirs on this test clip here: