MATRIXSYNTH: Spectral Audio Neptune


Wednesday, October 15, 2025

Spectral Audio Neptune

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via this Reverb listing

"Unusual analog 3-osc monosynth. Somewhere between Moog and Roland SH. Lots of modulation, CV, and MIDI control. Built in overdrive/distortion. w/ PSU"


Features:

3 VCO with Range 0.14Hz .. 7kHz, used up to 5.3kHz
Sawtooth and Pulse Wave on OSC1 and OSC2
Sawtooth, Triangle, Pulse, Random on OSC3/LFO
OSC3 switchable as LFO
Noise Generator with Spectrum DC..100kHz
Octave Switch for OSC2 with range 32' .. 4'
Octave Switch for OSC3 with range 64' .. 8'
Slide
Sync of OSC2 to OSC1
External Signal source
True Ringmodulator
Mixer section
24dB Cascade filter with Lowpass and Highpass
Self resonant
Keyfollow switch 0-50%-100%
Four Modulation targets of OSC3/LFO: Mixer, Cutoff, OSC1, OSC2
Six shapes of OSC3/LFO: Sawtooth, Triangle, Pulse, Random, Noise and OSC2 signal
Free run switch to have OSC3 free of the keyboard
Filter and Volume envelopes where Filter envelope can be positive or negative modulated
Distortion section with regular Distorter and Fuzzer
Volume
Power switch
Power on led

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