hey man wtf is a g2? im guessing youre talkin about some modeler, and you just used a ****ed up verb.
try to find a mesa/boogie based model on there, (probably something like "california crunch" or along those lines--not rectifier) and focus on your mids/ a little bit of highs. bass around like 6~4. this all depends on the rest of your rig. to be honest, this is pointless as i cant really help you dial in a tone over the internet. theres really nothing you can do but tweak and listen. alot of his tone comes from the way he plays too--just imitating his picking dynamic will get you halfway there.
The Zoom G2 comes with a pre loaded 'Santana' sound.

Read the manual.