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Synth (Analogue / Subtractive) Plugin by Subatomic Labs
Mantis307 by Subatomic Labs is a Virtual Instrument Audio Plugin for macOS and Windows. It functions as a VST Plugin.
Windows 7/8/10, or above
OS X Yosemite or above
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Mantis307 is described as "a fat, mean, and rubbery VST synth influenced by the raucous sonic stylings of classic synths like the TB-303, MC-202, Nord 3, OSCar and Juno 60".

It features "killer" unison and distortion, as well as constant time-slide ("portamento done right"). In addition, sync, mono and polyphonic modes, keyboard tracking, and 3 envelope curve types, and much more. All with a low CPU footprint that lets you layer many mantis sounds without breaking a sweat.


  • 2 oscillators per voice - Saw, Sqr, Tri, Sin, Pink/White noise.
  • 1 sub-oscillator per voice for extra fat basslines.
  • Hard sync, hidden sync oscillators give each main osc its own hard-sync sound.
  • Trigger sync, restart each oscillator for each new note.
  • Detune, with detune copy/paste quick buttons.
  • Oscillator mix.
  • Unison modes - mono, stereo, or chorus modes adds 1, 2, or 5x the voices.
  • Unison detune, 2 different detune styles, "dirty", and "clean".
  • Smart voice allocation:
    • Monophonic and polyphonic modes.
    • Aggressive constant time slide.
    • Polyphony limiter - take control over CPU usage.
    • Legato mono-mode (polyphony == 1) enables constant time slide, skips attack phase of envelope.
    • Legato poly-mode (polyphony > 1) true legato, skips attack phase of envelope.
  • Envelopes:
    • 3 envelope shapes - linear + 2 different curves.
    • Amplitude ADSR.
    • Filter ADSR with Amount and Velocity sensitivity.
  • Filter:
    • 4 pole Moog-style filter with cutoff and resonance, can self resonate, cutoff is envelope controlled.
    • Keyboard Tracking of the cutoff parameter (3 modes off, normal, bright).
  • Distortion unit:
    • Wet/dry mix.
    • Gain.
    • 3 types, Tube, Thin, Hard-clip.
  • Volume Output Level.
  • Preset Manager featuring many built in presets with save/load and rename functions.
  • Low CPU footprint lets you layer many mantis sounds.

Latest User Reviews

Average user rating of 4.00 from 1 review

Reviewed By Tonmann [all]
July 7th, 2018
Version reviewed: 1.9.4 on Windows

It'a actually a one-trick pony...or not to be so harsh...a two or three-trick pony;-).

This VSTi is definetly no all-rounder but if you're after really "in the face" basslines and leads like one could create with Access Virus or similar synths, you should give this one a try.

The UI is a bit old school and could be improved regarding usability (missing auto-center, some knobs too sensitive) and I'm missing stuff like portamento (glide), but all in all it's a good value for money.

The current version seems to suffer from stability issues when run in Reaper, maybe there will be an update fixing this some day.

Read Review

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Comments & Discussion for Subatomic Labs Mantis307

Discussion: Active
11 July 2018 at 11:58pm

Thanks for the review! 'portamento (glide)' is found in Mantis307 as Legato and Slide and Number of Voices = 1.

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