Be sure to add me to your favorites list Roland SDE-2500 Digital Delay Processor Midi Rack Unit Original Owner's Manual. This is an original Roland owner's / user's manual for the SDE-2500 rack mounted digital effects unit. It is an original manual in good condition, with only a little wear on the covers, and no writing or tears on the pages. From 1985, made in Japan! Thanks for looking! This is a manual or document, this is NOT a piece of equipment or instrument. If you have any questions, I'm always happy to answer them. Thank you so much for looking! Thanks for looking! Check out my Store!