→External links
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* [https://rubidium.dyndns.org/~magnus/synths/friends/stopp/#3.1 ''ASM-1 Analog Synthesizer VCO Module]'' by Gene Stopp and additional text by Magnus Danielson
* [http://groups.yahoo.com/group/cgs_synth CGS Synth discussion group], for discussion of locating parts, modifications and corrections etc.
* [http://bompiler.com/pcb/cgs48 CGS48 BOM] at BOMpiler
=== Suppliers ===
* [http://www.elby-designs.com/webtek/cgs/cgs48/cgs48_vco.html CGS48 VCO], revision 1, Elby Designs
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