A second demo of the LM4250, this time with a sequenced oscillator into it, and the various modulation of the LM4250's cutoff.
From memory, I think that I used a trick commonly employed with filters - particularly the Polivoks clones: You listen to the Lowpass output, but take the Bandpass output, invert it, and use it to FM the cutoff. This is made even easier on the LM4250 because the attenuator for the FM input is bipolar, allowing you to invert the bandpass signal without using an external inverter. The result is yet another level of distorted carnage!
Another technique that gets used with Polivoks filters is to take the Bandpass output, invert it, and feed it back into the input along with the original signal. This also creates utter bedlam, although I've not used this technique on this demo.
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