The XTi1000 has in input sensitivity of 1.4V at 4 ohms/ch in stereo mode and will be slightly less in bridge mode.
Line 6 sez that you can plug into a guitar amp or take headphone out to the PA.
They don't say anywhere what the output levels are but the headphone-out should give you plenty of voltage
to drive the XTi. I would suspect a lot of noise at high output/headphone levels, so you just need to try it
and see how it is. I've never had any feedback problems with my BassPod XT but don't know anything about
the PocketPod. I would do like Atom Bomb says and turn it up bit at a time until you get to where you want
to go or Not.
Sounds like a Sweet rig!
