Be sure to add me to your favorites list Original Roland Booklet for the Roland OM-500 Upgrade Kit for the MC-500 Sequencer, from 1988. This is a good condition supplemental user's manual that I found in my stacks of documents, an original document from Roland. It's the booklet for the OM-500 Upgrade Kit, which is used to upgrade the MC-500 sequencer. It's in used but overall good condition, and has an English section and a Japanese section as well. This is just for the booklet shown, no other items included. 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! Check out my Store!