The title tells it all, Positive Grid, developers of the JamUp Pro XT guitar app and it's Multi-FX System, partners with AirTurn, makers of the BT-105 wireless foot-pedal controllers. This will allow users to work the multiple guitar effects on an iPad app using the AirTurn foot-pedal device, as guitarists are already so accustomed to doing.

http://www.technologytell.com/apple/111077/jamup-pro-xt-integrates-guitarbass-multi-fx-system-with-wireless-foot-switch/