[sdiy] Basic 4th order LP butterworth filter papers

[Paul Maddox]

Justin

Sure if I make any progress, or find anything out I'll let people know :-)

Paul

> Based on Tom W's post I'm going to have a look at a single supply version of the 13700 VCA just to see what happens - but I'd definitely be interested in any progress you do or don't make with transistor-based VCA's - if you don't mind passing the info along...
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