Ok, now I see what you have. It's essentially an effects board. Similar in principal to my Zoom G3N.

If you haven't already done it, download and read the owners manual. I just skimmed it. It's 251 pages long, so you can see why I skimmed it. On pg 39 it describes amps - you have 256 amps to choose from. Pick one and from there you can begin to play with gain, volume etc. Just like on the real amp.