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Virtual Analog Synthesis with a Time-Varying Comb Filter

The bandlimited digital synthesis model of Stilson and Smith is extended with a single feed-forward comb filter. Time-varying comb filter techniques are shown to produce a variety of classic analog waveform effects, including waveform morphing, pulse-width modulation, harmonization, and frequency modulation. The techniques discussed are not guaranteed to maintain perfect bandlimiting; however, they are generally applicable to other synthesis models.

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