- Get a quarter-inch, a DI, and an XLR.
- Make sure that your guitar batteries are FRESH and your tuner is OFF.
- Connect your guitar's pickup* to your DI with the quarter-inch cable.
- Use the XLR to plug the DI into channel 14 (or 2).
*If your guitar doesn't have a pickup, you'll have to use an instrument mic instead of a DI.