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 Mantis307 by Subatomic Labs is a Virtual Instrument Audio Plugin. It functions as a VST Plugin.
Product Mantis307
Developer Subatomic Labs
Price (MSRP)
Type / Tags Synth (Analogue / Subtractive)
Plug-in, App & Soundware Format(s)
Operating System Availability
Download Released
Downloads Released
System Requirements
Windows 7/8/10, or above
Downloads Released
System Requirements
OS X Yosemite or above
Miscellaneous Information
Copy ProtectionKey File

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
July 7, 2018

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.

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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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Average user rating of 4.00 from 1 review

Subatomic Labs
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