Have you checked
www.rolandus.com There should be a manual for the EM-2000 there. The EM-2000 is a bit dated by "today's standards", but would still be a nice arranger to own. The only thing that comes to mind about the EM-2000's that I can think of off the top of my head was the stability of the Zip Drives. I know there were some issues. If you buy one from Ebay, ask the seller about the Zip Drive, and make sure it's functional.
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GEAR: Yamaha MOXF-6, Casio MZX-500, Roland Juno-Di, M-Audio Venom, Roland RS-70, Yamaha PSR S700, M-Audio Axiom Pro-61 (Midi Controller). SOFTWARE: Mixcraft-7, PowerTracks Pro Audio 2013, Beat Thang Virtual, Dimension Le.