Hey that's a good deal! I was in the same boat as you, got a used XP-50 for $750 without any manual. I called up Roland U.S. customer service, asked for a manual, paid them about $14 including shipping, and received a photocopied manual in the mail after about three weeks. Their phone number is (323)890-3700. Also check out their website at
www.rolandus.com for additional info you can't find on the manual.