Do you have all of the model packs? The only one I have is the metal amp pack, which came with my PODxt when I bought it. I find my favorite amps to be the Soldano SLO100, 5150(Criminal), Spinal Puppet, Vox AC30, Marshall JTM45, and the Fender Double Verb. The "Big Bottom" model sounds great for that tight super high gain stuff, but it doesn't sit in the mix very well, unless you use a very similar tone to go with it. I'll try to get my PODxt hooked up tonight so I can get a few patches up.