You could, with the iRig or an interface connected thru usb with the camera connection kit (ipad only).... I really don't recommend using the mic/headphone jack method... You'll get a really nasty noise floor in there... Better to use an interface or the io dock or something pro to have a good Analog to digital conversion.
Connect the iRig to your device - connect an input cable to your iRig, click record on a pad in bm2, play your source... Pretty straight forward... But it sounds like crap if you ask me.
Note: it's the iRig guitar cable... Not the midi stuff.. Hehe
I know it might be out of some people price range but the io Dock by Alesis is great. plus it does make it look more MPC looking <!-- s --><img src="{SMILIES_PATH}/icon_lol.gif" alt="" title="Laughing" /><!-- s -->
Io dock just has new noise issues either with outputs or/and inputs everytime an app or ios updates, and then the blame game ensues, and then finally right before something updates a fix comes only to be replaced by a new issue. I love the io dock when it works. There is a lag of communication somewhere in the chain that needs to be fixed obviously.
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Note: it's the iRig guitar cable... Not the midi stuff.. Hehe