I got Pertrucci's tone but it's not cheap... you can pretty much get any Petrucci tone from the Mesa Boogie Triaxis... as far as the 7 string goes, the Petrucci sig EBMM combined with the Triaxis nails it solid. Also, the Triaxis settings are posted on petrucci.net Check the site out for other amps and gear, you may be able to find a few suggestion in the forum for the GT-8