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    How can I simulate a lowpass filter sweep with a 4-bit, 32-sample programmable sound generator?

    I'm trying to simulate a lowpass filter sweep on a sawtooth wave, with a touch of resonance, on a programmable sound generator. The PSG lets me create an unlimited number of arbitrary 4-bit, 32-sample waveforms. I can change waveforms every 16 milliseconds with no noticeable gap in between...
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