via musicsynthesizer.com where you'll find the full article."Although the VCF implemented in the 3372 is a standard 4-pole low pass, the additional circuitry made of UX14, UX13, UXI5, UX17 and the one percent resistor array on the left of UX17 allows 15 different filter modes including high pass, band pass, notch and all pass. Understanding how this magic trick happens requires a little theory."
see the musicsynthesizer.com homepage for more DIY.
maybe it's the same trick used for matrix12/xpander ?
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ReplyDeleteWe're talking about 3372 which is the chip used in Xpander, and these are from the service manual.
ReplyDeleteSee page 26 or so for example in http://soundprogramming.net/manuals/Oberheim_Xpander_ServiceManual.pdf
yes, but not all synths using 3372 has 15 differents filter modes ...
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