This shows how to set up two L1 in stereo...see last two diagrams at bottom of page.

http://toonz.ca/bose/wiki/index.php?title=Connections_/_DJ_VJ_Computer_to_Model_I
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.