I have bought cables and hooked up my ipad to a casio WK-240 with the intent of playing Garage Band instruments through my casio keyboard. I have entered the MIDi setting on the casio and turned Local setting to off but the only instruments I can hear through my casio speakers is the Garage Band instruments played on my ipad. the keys on my casio keyboard will not play the Garage Band instruments. What am I missing? Any suggestions?