Update: August 2015
GR-300 Filter Mod: LFO to Filter Modification
GR-300 Output Mod: Increase the output of your GR-300!
GR-55 Schematics, Service Notes: Full factory service notes for the Roland GR-55
Ibanez MIU8: Specs, photos, details on the rarest of rare!
MIU8 Schematics: Schematics and Service Manual (pdf)!
Korg Z3 Product Page: From early Product catalog!
Roland GR-77B Updates: Finally! The Roland GR-77B and G-77 pages have been updated. Be sure to check out the G-77 page as well.
Hamer A7 Guitar: Added to the guitar pages, a tribute to the Hamer Phantom A7! Tubo Lover rocks!
GR-500 24-pin Connector Change: Documentation of the change from the original, pin-type C24 connector to the much more common C24 positive (locking frame) connector.

Welcome to the Vintage Roland Guitar Synthesizer Resource Site!

This website is dedicated to providing comprehensive, complete and accurate information on vintage Roland 24-pin guitar synthesizers, controllers, and related accessories.

I started this website more than a decade ago when there was very little information online about vintage 24-pin synths, and a lot of the information I could find was wrong.

Please dig in and learn more about the first sustained effort by Roland Corporation to expand the sonic tools available to guitar players. You will find photos, technical information, service manuals, owners manuals, vintage advertising plus video clips on a variety of cutting-edge gear from the late seventies to early nineties.

This website is possible because of the many GR users who have helped by contributing photos, service bulletins, etc. to make this resource more complete. Feel free to email me if you have questions, corrections, etc. And many thanks to Dempsey Elks who dug through his Guitar Player archives, and emailed me the original Craig Anderton GR-300 article modification article that comprised the original website.