I have purchased a stereo set of powered, external speakers (120 W RMS) that are in a bookcase about 15 feet in back of my music bench. The MS04 Tyros4 speakers are connected and project the sound towards the player while the bookcase speakers are in the back of the player (but project well to any people listening in the room). If I attach those speakers to the Main outputs, they nicely reproduce (at the back of the room) the MS04 sounds which come from the front of the room. I tried to get an even more spacious sound by connecting the bookcase speakers to the sub1 and sub2 outputs for the right hand sounds only. I thought that in this way, the melody will be more nicely separated spatially from the accompaniment all of which are output to the MS04 speakers. However, as stated in the manual, the sub1 and sub2 outputs do NOT send the reverb to the bookcase speakers and the right hand sounds are too "flat" without the reverb. Does anyone have any suggestions on how I can use my speaker system (no surround sound or reverb switches are found on the bookcase speakers) to get only the melody including reverb from the extra speakers?

Thanks,

Sam