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Microvolt 3900 is an ergonomic and intuitive approach to analog synthesis. It makes use of an all analog temperature stabilized dual VCA core routed into a pair of waveshapers that open the proverbial gates to harmonic nirvana. In addition to additive synthesis, Microvolt 3900 is capable of generating traditional subtractive synthesis waveforms thanks to its integrated state-variable filter, which can be configured for self-oscillation if so desired.
The core of the synthesizer makes use of Pittsburgh's proprietary "three dimensional" VCA technology—which, compared to the more rigid operation of most traditional VCAs, lends distinctly naturalistic characteristics to outgoing audio. This is because the VCA removes harmonics as it closes and reintroduces them as it opens. Needless to say, the result is both energetic and organic, perfect for the kind of "plucking" and "striking" found in percussive patches.