1) If you're new to Fractal amp modeling like me, I strongly suggest that you don't do your first listen through headphones. I tried ATMH-50x cans (brand new) and my Sony MDRV6s from the 80s. I preferred the Sonys, but neither provided a decent listening experience. Hook it up to studio monitors, and FRFR, pa etc...
Using the y adapter from the outputs to my headphones, I have the Out 1 gain up all the way and it's not really loud, but plenty of volume for listening. I just don't think it sounds all that good when I know this thing sounds great.
2) Have the manual with you. If you're not hooked up to AX8 edit, it's not very intuitive to get around. I had to look at the manual to figure out how to switch banks. I understand why the silk screen labels were not included on the final product, but you'll need the guide to know what the function switches do. Fortunately I understood the 8 block screen and the x/y switching because I had an FX8. But you might want to read the manual about those as well. It's simple once you know what does what.
I'm definitely going to need to look at the manual to understand the grid because I don't get it from looking at it in play mode when I go to that page. If that's what I'm looking at...
But the editor makes a lot of sense and seems like it's relative reasonable to navigate.
JUST SKIP THE HEADPHONES!!!!