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== Circuit building block ==
The device's cutoff frequency can be [[Exponential|exponentially]] [[voltage controlled]] over a 10,000 to 1 range. It is an extremely flexible circuit building block which can be used in virtually any active filter design including low-pass, high-pass, band-pass and notch. Roll-off characteristics can be selected to be Butterworth, Chebyshev, Cauer, Bessel or any other filter type.<ref name="data">[http://www.sdiy.info/wiki/File:
== Clones and schematics ==
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== Further reading ==
* [http://www.sdiy.info/wiki/File:
* Build a better music synthesiser by [[Thomas Henry]], Tab Books Inc, 1987, ISBN 0-8306-2753-3, Chapter 6: ''A four-pole lowpass VCF – SSM2040''
* ''Electronic Music Circuits'' by Barry Klein, Howard Sams, 1982,ISBN 0-672-21833-X, pages 125-126, 135-137, 141
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