make sure you got the midi out on your midi controller to the midi in on the uno and the midi out on the uno to the midi in on s900. As long as your computer recognizes the uno your good.

Matt's right the SP12 is a dope machine, you just got to experiment with it a bit more. Certain sounds I sample, certain drums whatever, always get assigned to the same specific channels. s**t like hats, all my hats go to the same channel, all my bass goes on the same channel. You can use "blank" pa...