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 Viper by Adam Szabo is a Virtual Instrument Audio Plugin. It functions as a VST Plugin.
Viper Viper Viper Viper Viper Viper
Product Viper
Developer Adam Szabo
Price (MSRP)
Type / Tags
Plug-in, App & Soundware Format(s)
Operating System Availability
Download Released
- Released
Miscellaneous Information
Copy ProtectionSerial Number
Important Note
64-bit version coming soon.

Viper aims to deliver the sound characteristics of legendary hardware synthesizers in a virtual format. We can call Viper a Virtual Performance synth, with a vast array of features like: multiple oscillator types with user waveforms, Sync, Frequency Modulation, Ring Modulation, unison up to 8 voices, filter saturation, filter routings, mod matrix, high quality effects, a powerful arpeggiator, and much more.

A lot of time and research has been invested to make the sound engine of Viper capable of delivering a wide array of sounds, everything from smooth, lush pads, huge basses, and powerful leads, typically associated with traditional analog synthesizers. This was achieved with careful coding, experimenting, analysing hardware synths, and using the ear to fine tune the controls. A constant randomization is also active in the synth to slightly alter its sound to mimic electronic components.

The engine is written in optimised code to use as little CPU consumption as possible, while maintaining a high quality sound engine, finding a good balance between the two. The synth automatically turns off any parts that are not used to further reduce CPU usage. Viper also has a smoothing algorithm for its controls to remove the 'steppyness' when it goes between values to give that extra polished sound.

Key features:

  • Classic Oscillators with user waveforms.
  • Multisaw (up to 9x Sawtooth waveform).
  • Sub Oscillator.
  • Noise with coloring.
  • Punch.
  • Osc Sync, FM, RM.
  • Unison up to 8 voices.
  • 2 Zero Delay Feedback filters with Low Pass, High Pass, Band Pass, Band Reject (notch).
  • Filter Saturation curves.
  • 4 Filter routings: Serial 4, Serial 6, Parallel, Split.
  • 4 Envelopes: Filter Env, Amp Env, Mod 3 and Mod 4.
  • 3 LFOs with Oscillator shape morphing.
  • Mod Matrix.
  • FX:
    • Character (analog boost).
    • Distortion.
    • Filter effects: Ring Modulator, Frequency Shifter, Vowel Filter, Comb Filter.
    • Phaser.
    • Chorus.
    • Delay.
    • Reverb.
    • Equalizer.
  • Arpeggiator with user patterns.
  • Built in Preset browser.
  • Section locking.
  • MIDI learn.
Made with FlowStone
Latest User Reviews Average user rating of 5.00 from 1 review

Reviewed By ubailey
January 29, 2018

I downloaded the demo just to play with the features. I ended up being totally blew back to the point I ended up buying the synth the very next day after sound testing it for about an hour.Easy/nice looking interface and easy to navigate. I love the two filters, but what impressed me the most was the arepeggiator. I cross compaired the arp function in viper to the one in dune 2, and viper by far won this battle as the arp is very powerful with many presets and customizable options. The arp unit makes it very easy to come up with a new song concept in seconds at the push of a button It has some very nice factory presets, that do not sound like other synths out their, and I just discovered a whole second bank of patches to use, which means it comes with 256 patches altogether. The matrix functionality is awesome as well, and the effects section is also very powerful with some filter options including a vocoder filter. this hyas easily become my number 1 synth to go along with dune 2 and serum. This synth is a monster. Many people seem to be thrown off by the 32-bit version. Apparently many daws out their make it difficult to use 32-bit programs, but that wasnt an option for me at all, as my 64-bit version of fl is compatible with 32-bit sw without needing any extra plugins. So, for those who choose not to buy it for that reason, only makes me happier, as I know there will be less people out their with the same sound I have. If you like the access virus, then this is a way cheaper option to get the same sound from a brand new synth. This will be one of the top synths of 2018.

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Discussion: Active



28 January 2018 at 4:02amubailey

I sound tested the demo for hours against dune 2. Viper won in my opinion even though dune 2 is still a kick ass synth. But viper is so easy to use, and the factory sounds it has are absolutely awesome. The arpeggiator is actually better than dune 2, way better imo. Its only 32-bit currently but 64-bit is on the way. Iuse fl studio so 32-bit is no issue to me as i tested the features of this synth extensively, and that left me with no choice but to buy it. This is definitely going to become my #1 go to synth over both Serum and Dune 2. I will still use serum and dune 2 as they do some awesome things, but this Viper totally blew me away the very second i downloaded the demo. Just installed the real version and this will comprise most of my upcoming beat mixtape. Im so excited to use it.

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Average user rating of 5.00 from 1 review

Adam Szabo
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