The beatpad only supports 2 decks from what I am aware of… I am sure in 2016 we will see 4 ch Ipad controllers released that will work with DJay Pro (iOS). The Pioneer DDJ ERGO has 4 deck support for DJay Pro (OSX) I am thinking that it should work with the iOS version or will work soon with it.
Only 2 decks on the beatpad
