The Derp-O-Phonic 2000 finally has a filter (two actually). This is a test run using a very simple patch. It's a 4093 nand synth with the cutoff being driven by a slow triangle LFO along with a faster square LFO.

The filter has some interesting quirks.When I turn the CV for the square wave all the way off, the ambient noise that is being generated cuts out. Not sure why. The CVs for the two filters can bleed into each other. You can actually use the resonance of the filter to drive sweeps with no signal at all.

It's an odd filter, but I like it.

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