I do have a midi out on the second keyboard. but am unsure how to get two different sounds. I went and changed the midi channel on both the m-audio 88es and on the privia. It does not make two different sounds at this time. But I know that this may be my error, not understanding the privia. I don't have a midi in on the m-audio controller. Does this need to be plugged in too. I do have another radio shack keyboard (old and cheap) I can try. The privia and the m-audio are speaking with each other though. I can play the midi controler and hear the notes on the privia play, but I am having trouble getting different sounds on the privia controlled by the m-audio at the same time. Like an organ on the m-audio and a piano on the privia. I think that there are zone selectors that you can put different midi channels. But I am unsure how to do this at this time. I am reading the manual now again. Please reply with any feedback. Thank you in advance so much.