The Ipod is stereo. You need to connect that to two inputs (that's definitely not pins 2 and 3 of the same XLR, it will give you a mono signal consisting of the differentce betwen L and R from the ipod - very weird)

Do what I suggested and use two jacks into a stereo channels on the mixer.
The wiring goes like this:
* headphone tip - left jack tip
* headphone ring - right jack tip
* headphone ground - both jacks ground

You can buy a ready-made cable to do that from a good audio shop.

I'd use the phantom power for the C1000 and get a DI for the fiddle.
Batteries are just one more thing to worry about.

Anahata