you can program 5 x 25 presets on the vamp, all sorts of amp- cab and effects simulations are available including overdrive, distortion and wah effects.
the presets are accessible via any MIDI pedal as far as i know, i don't use one myself.
i really love the vamp, amazing value! in case you care, here is the link to download the manual:
http://www.behringer.com/assets/LX1B...P0155_M_EN.pdf