Be sure to add me to your favorites list Original Korg Solo Synthesizer Guide, Supplemental Owner's Manual Book for the Trinity, Trinity plus, Trinity pro, and Trinity proX This is an very good condition original Korg book, the Korg Trinity Solo Synth Guide manual. This is a very detailed 88 page supplemental owners manual about programming the Solo synthesizer feature, that will be extremely helpful the Trinity Workstation, the Trinity Plus, the Trinity Pro and the Trinity ProX models. Very helpful and handy too, a genuine Korg document, printed 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!