Chris Stelloh have been playing around with Jürgen Haible Wasp CV Filter and sent me two verified layouts..
In hi sown words:
I had a chance to build up that LM13700 version of the Wasp Filter and found that using a much different value of potentiometer for the cutoff control made for a better filter sweep.
This one is also verified. It contains a level pot that cuts or boosts the CV level. The oscillation switch implements the modifications that people have come up with for the Doepfer A-124 - which is a module that is basically a wasp. Albeit with some minor part value changes, as well as a HEAVILY modified CV and frequency/cutoff section.
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