First of all, put this thread in the tone and effects forum.

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!