I've run the 4cm method with the Pod and the JC120, but I spent too much time getting the preamp settings to mimic my home-studio settings. Plugging into the FX return (bypassing JC preamp and only using the more than ample power-amp) my sounds sound great in studio direct mode with very little additional tweakign needed (or none at all depending on the room and the amp model I'm running). If I'm far from a wall, I might increase my mids on a patch, maybe some bass, but that's it. Of course, this is my mileage, and what works for my ears.