Can anyone tell me how do I make for those about to rock (we salute you) sound with my G1X?
I have one of those , I suggest making a new patch with the following in it.

For distortion use the Pu one , with the gain anywhere from 20-30 , you eq by preference , I usualy set the Eq boost to 10 , bass to 12 , mid 18 , treble/high 16 or C9.
No modulation , no delay , reverb by preference.

Also I think there are a few AC/DC presets in the unit already , read the manual.