Don't use the distortion on your AVT, 'cuz AVT's are solid state, and solid state distortion aint gonna get you far trying to emulate petrucci.
I have no experience with zoom effects (I'm assuming the GFX is a multi effect, amp modeler unit) but most multi-pedals have websites that you can see presets that other people post (I'm also assuming you can make presets).
Goood luck!
There are only two important things in life - There's music and theres girls, not necessarily in that order....
The Ace's Guitar Tricks
The Ace's Guitar Tricks