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Update: March 10, 2025

Great news, we have gone through the entire site and weeded out all of the bad and/or dead links etc... The site here at this URL https://nuxmicromedia.tripod.com/cgi-bin/dx4op.cgi will remain up, as it is, as our 'Legacy Site', and we are working on building a 'Modern Site' that has updated features such as 'flexbox' and 'updated CSS' to handle responsive scaling for phones/tablets etc... That URL is http://4ophq.nuxmicromedia.com (while that site is being worked over it's traffic will be redirected to this legacy site). We appreciate everyone's interest in keeping our beloved 4op synths alive and 4OPHQ will continue to try to bring all of the 4op community the best resources for their synth's that we can! Thank you for supporting 4OPHQ. -Nux

Continuing the 4OPHQ Legacy

4OP H.Q. is the ultimate site for YAMAHA 4 operator FM synthesizer users. To get started choose a link from the menu at the right or select a model from the list above. We are working hard to provide as much information, files, etc as possible for every model. This site greatly depends upon the 4OP community to keep it growing with content. If you have any info, files, patches etc and would like to contribute please share with us on our Facebook page.

A huge thank you to all who have contributed!