Be sure to add me to your favorites list Original Yamaha Midi Data Format Booklet for the MDF3 Midi Data Filer, Original Yamaha Document, made in Japan. This is the Midi Data Format booklet for the Yamaha MDF3 midi data filer unit. It's an original document from Yamaha and has the very detailed MIDI data not found in the main manual. It's 4 pages (2 pages front and back) and in very good condition. From the 1990's, extremely useful if you want to know everything about the third MDF model! 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! Please check out my Store!