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* [http://groups.yahoo.com/group/cgs_synth CGS Synth discussion group], for discussion of locating parts, modifications and corrections etc.
* [https://web.archive.org/web/20170419010038/http://www.cyndustries.com:80/synapse/synapse.cfm?pc=43&folder=march1977&pic=31 Synapse March/April 1977, p. 30]
=== Suppliers ===
* [http://www.elby-designs.com/webtek/cgs/serge/cgs87/cgs87_prog.html CGS87 Programmer Sequencer], revision 1, Elby Designs
[[Category:CGS modular]]
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