Analog synthesizers continue to be used by many musicians because of their distinctive timbres, intuitive real-time control and flexible patching. There has been recent interest in simulating the analog signal chain with digital techniques. However, a literal time-domain translation of analog VCOs and VCFs is surprisingly challenging. This paper presents a new strategy for digital simulation based on spectral descriptions of analog modules and additive synthesis techniques. A real-time software analog synthesizer has been implemented based on this strategy. Audio output is qualitatively close to that of analog synthesizers.
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