Thanks. But I realize that one can output all the sounds to the main outputs. I am trying to split the sounds among the speakers: Using the Mixing Console (Tab to Line Out) you can direct different parts of the Tyros to different speakers. Thus, for example, the styles and midi could play through the main line outs and the right hand voices can play through the sub1 and sub2 line outs. If you have 4 speakers, as I do (the MS04 and two other powered speakers at the back on the room), the styles would be heard through one set and the right hand voices would be heard through the other set (placed at the back of the room). This would indeed give a type of surround sound. It actually works and gives a realistic separation of the "solos" (right hand voices) from the "back up band" (the style parts), BUT for some reason Yamaha decided that sub1 and sub2 do not output the reverb Thus, the right hand voices are quite "dry" with no reverb. I was wondering if there were a solution for this, since if possible, it would give the Tyros4 great spatial separation of the various parts of the band if one connects 4 sets of speakers (two from the MS04 and two from the sub1 and sub2). Hope it is clear now and that someone has a suggestion.