I couldn't see any connections to turn off. It's logic. So after looking at some other threads find the answer was to set up a new instrument in environment and then cable the spark private to it. Works perfectly. It's a great controller and the sounds are up there and the combination of decent sounds with intuitive controller make for a great tool for beats, something I found such a pain with logics ultrabeat!
By the way, got v collection free in arturia hybrid madness, what fun I've had!