Ive got the floorpod and I've got to say, great bit of kit.
You can't turn off the amp modelling, but if you want distortion you need to choose from the available amps that are on there for distortion, by that I mean distortion settings are under amp modelling not effects. The amp options are clean, RnB, Rock, Brit, Grind, Synth. You can get a great bit of distortion with the Rock, Brit and Grind, they really do sound like completely different creatures too!