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== External links ==
* Ken Stone's notes about [https://web.archive.org/web/20030618014214f/http://www.cgs.synth.net/organ/index.html electronic organs]
* [https://web.archive.org/web/20170430153353fw_/http://www.cgs.synth.net/synth/index.html History]. A little about how Ken Stone became involved with synthesizers, building and playing these entirely for enjoyment and the consequences of not being able to afford the expense of kits, 1999, (archived).
* [https://web.archive.org/web/20170430151727/http://cgs.synth.net/ "Modular Synth", the CGS web site] on Archive.org
* [http://www.synthpanel.com/ "Modular Synth", the CGS web site] on synthpanel.com
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