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Synth (Hybrid) Plugin by ConcreteFX
No Longer Available
Viper by ConcreteFX is a Virtual Instrument Audio Plugin for Windows. It functions as a VST Plugin.
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Viper is an FM / additive hybrid synthesizer that can create range a broad range of organic leads, pads and basses.


  • 4 oscillators - each oscillator can be modulated by any other oscillator (including itself for self-modulation) creating the possibility of 65536 different modulation setups. Each modulator can use frequency or ring modulation to create an enormous variety of different sound possibilities. Combined with this, each oscillator has symmetry & pulse width modulation control and oscillator syncing.
  • Over 100 additive waveforms, plus the normal analogue waveforms, allowing for a wide palette of sound sources.
  • Two multi-mode filters, with 12/24 db low/high/band pass/notch filters plus ring modulation, comb filter and formant filter for vocal sounds.
  • 6 AHDSFR envelopes with variable curvature and 6 LFOs. These, along with MIDI and keyboard events, can alter all the major controls, using a simple to use modulation matrix.
  • Full MIDI control of all the controls using MIDI learning.
  • Step Sequencer with up to 16 steps which also can be used in the modulation matrix to create trance-gate sounds & simple sequences.
  • Chorus, stereo delay & stereo widener effects.
  • 200 presets + full manual.

Latest User Reviews

Average user rating of 4.00 from 1 review

Reviewed By Richard Lichten
October 13, 2006

Concrete FX synths are something of hidden juwels. Always cheap, powerfull, innovative and unique sounding, they seem to pass the mainstream of Vsti curiosity. Viper is no exception, unfortunatly, despite one of the most unique sounding synths i know of, it doesn´t get much recognition. What a shame ! Why?

To begin with, Viper is extremly complex, cheap, and easy to programm. The GUI is visually appealing and well designed, and is - with the one-page-design - intuitive. There are options en masse; from around 100 resynthesized waveforms, 4 Oscillators with fm, sync and filter bus routing to chose, to 2 filters with exoctic types like comb or formant filter, several LFOs, envelopes, an arp/ step sequencer, (not) ending with a modulation matrix, good effects, portamento and legato options, and midi learn. Like all CFX synths, it is really a semi-modular synth; but unlike some of the more early ones, it has a finished, polished feel to it.
This extend to the sound, of course. Like all CFX synths, Viper sounds basically warm, with some machinesque spark to it (hard to describe).With 4 OSCs and mainly digital sonic outlook, it has something of the tone of huge 80ies synths, maybe a cleaner Version of the PPG, but - and here comes its name in - differs in sounding dry, sometimes biting, and very organic. It can do nearly everything soundwise, deep basses, great athmospheric pads, machine fx, leads, organs, but excels at reed-ish, brassy and even guitar-like feedback sounds. Whats so great about Viper is the way it moves itself in the mix; even overbearing sounds blend in nicely. Also, it is immensely playable, its organic, moving timbres allow really expressive and immersing playing - really a musicians synth.

What else ? Documentation is too technical, though complete, presets are great, price is too low (feature-and soundwise, its rather in the 100-200 € category), support is outstanding.
Give it a try ! Very recommended.Read Review

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