HI.i own the fz-10m rackmount ver. of that keyboard.what you need to do is assign each voice to a designated output.you do this by going into bank edit(of course after loading up some sounds),then into create bank,then after assigning a sound scroll down and you'll see output.her you select the output1-8 by a yes or no.let me know if that helps you out.good luck. theNEGATIVEmc