Quote Originally Posted by Spudman
Try another device into the DI and see what level of signal you get then. It might be that your guitar/pedal combo doesn't have enough output - or -the DI is bad.
After some reading on impedance, I think I'm going to read up on the mixer and see if there's a hi Z phone input for that channel, since my theory is that going line level (lo Z) to XLR in (probably lo Z) might be sucking some of the voltage.

BUT...I might try some of the troubleshooting mentioned above too. Thanks for the input.