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Plasmonic by Rhizomatic is a Virtual Instrument Audio Plugin for macOS and Windows. It functions as an Audio Units Plugin, a VST 3 Plugin and an AAX Plugin.
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Plasmonic combines the resonant depth of physical modeling with subtractive synthesis. The goal is for Plasmonic to approach the depth and detail of an acoustic instrument, while making it easy to shape the sound into anything you want. Its deep modulation capability and MPE support make it very playable and expressive.

The heart of Plasmonic is a self-oscillating delay-based waveguide/multimode ladder filter pair, which can be configured in parallel or in series. Each filter can take any combination of the audio sources as input. This creates some very interesting interactions between the audio source and feedback loop of the waveguide.

Audio sources include two wavetable oscillators, a sample-based impulse generator, and a filtered noise generator. Both oscillators have waveform transformations which nicely complement the waveguide. The impulse generator is especially suited for making the waveguide ring.

Modulation is deep and makes it easy to add detail and life to the sound. Each parameter has a popup panel displaying the depth, polarity and inversion of each modulation source, allowing unprecedented control.

The master section contains a 3-band EQ, a saturator which can be polyphonic or monophonic, modulated delay effects and a final resonator effect. Like the waveguide, the delay effects are capable of self-oscillation, which can lead to all kinds of sonic mayhem.


  • 4 audio sources:
    • 2 wavetable oscillators with dynamic wave transformations.
    • A special impulse generator for making the waveguide ring.
    • A noise generator with its own resonant lowpass filter.
  • 2 interacting filters:
    • A self-oscillating waveguide provides organic resonance.
    • A multimode self-oscillating ladder filter: LP, HP, BP, 1, 2 and 4 pole.
    • Each filter can take any combination of audio sources.
    • Can be configured in series or parallel.
  • Polyphonic saturation.
  • Self-oscillating delay effects.
  • Deep, precise modulation system.
  • Multiple ADSR and LFOs with unique features.
  • 6 configurable control macros.
  • MPE support.
  • NKS compatible.
  • Resizable single-panel graphic interface.
  • macOS: AU, VST 2 and 3, AAX, standalone, 64-bit.
  • Windows: VST 2 and 3, AAX, standalone, 64-bit.

Plasmonic is currently under development, so features are continuously being added and improved. Please note that Rhizomatic are open to suggestions.

{See video at top of page}

Latest User Reviews

Average user rating of 5.00 from 1 review

Reviewed By fneeee
May 20th, 2023

This PM+Subtractive combo beast is one of my very favorite synths. MPE, deep tweakability, pretty much guaranteed you can get impressive results at a minimum. The presets alone are unbelievable. If you like being rewarded for experimentation, big evolving sounds, and want to hear something you've never heard before, this one is a Rolls. Actually, this synth is why I decided I had to step further than poly aftertouch and get an MPE controller. Get at it.

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Comments & Discussion for Rhizomatic Plasmonic

Discussion: Active
23 September 2020 at 12:31am

When it wil be available?

15 November 2020 at 6:35pm

soon, developer said yesterday.

22 January 2021 at 3:50pm

It's available now...in fact the early purchase discount ended 5 days ago. No reviews yet, but the demo is very impressive (full features, 30 minute timeout, no saving). I don't know if I need it but it's more intuitive than other modelers I've used. Will have to spend more time with it.

22 January 2021 at 3:52pm

P.S. it also runs standalone, not just as a plugin.

22 March 2023 at 9:51pm

This instantly became one of my favorite synths, right up there with Absynth, and I find that Plasmonic usually creates flavors I want in my tracks, and can be adapted into any style.

Just like Absynth, Plasmonic caters to dreamy, swirling, evolving psychedelic sounds, but also does short attack lead sounds, bass sounds, plucks, winds, etc, very well.

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