From Craig Lee:
Yves Usson has kindly allowed me to produce a 4U board for his minimoog filter.
This is the classic Moog 4 pole (-24db) low pass filter. Serge never made a 4 pole low pass filter and this is a great addition to my synth.
My circuit is the same as Yves design with the exception of my using 2 TL071 op amps where he uses a single TL072.
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