Be sure to add me to your favorites list Original Yamaha REV-1 Rack Mount Reverberator Operation / Owner's Manual, made in Japan. This is an original User's / Owner's / Operation Manual for the Yamaha reverb effect unit, model REV1 in very good condition. It is complete and very helpful if you have these great rack mounted modules. This is an original Yamaha document, all in English language, made in Japan! 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. Thanks for looking, Check out my Store!