Rossum Electro-Music Announces Trident Multi-Synchronic Oscillator Ensemble

At the 2019 NAMM Show, Rossum Electro-Music is introducing their new TRIDENT Multi-Synchronic Oscillator Ensemble.

The latest brainchild of synth pioneer Dave Rossum, TRIDENT is a 100% analog, triple oscillator module that they say ‘opens up a universe of dynamic timbral textures’.

At its most basic level, TRIDENT is three precision audio VCOs, each sporting a unique variety of control voltage inputs.

The main or “Carrier” oscillator provides its three waveforms simultaneously. The two Modulation Oscillators each have a single output and a waveform selector. The Modulation Oscillators also have a voltage controlled Symmetry parameter which varies the duty cycle of the triangle wave output from sawtooth to triangle back to time reversed sawtooth, and also varies the sawtooth output to have an upward or downward kink in the middle, as well as controlling pulse width when the pulse waveform is selected.

And while each oscillator can be used independently if desired, it’s when they’re combined into a synchronous ensemble that the ‘real sonic magic happens’.

Zing Modulation

Rossum calls it “Zing” modulation. Each of the Modulation Oscillators can modulate each of the Carrier outputs in an amount controlled by the Zing parameter.

Zing modulation is mathematically akin to ring modulation, but due to the synchronization of the oscillators (when an oscillator’s Sync button on), the aharmonic sum and difference sidetones of ring modulation transform into complex but purely harmonic overtone spectra, which vary dynamically and dramatically with the frequency and waveshape modulations of the modulation oscillators.

Each change in the Modulation Oscillator parameters – Frequency, Symmetry, Waveshape, Zing, and (in the case of Modulation Oscillator 2) Phase – will have a different effect on the timbre of each of the three Carrier waveshape outputs.

When the modulation oscillators are set to track the carrier oscillator, the waveshape will remain constant as the carrier frequency changes. In this case the overtone structure is determined by the settings and CV modulations of the modulation oscillators. If instead the modulation oscillators do not track the carrier, some of the overtone structure will vary relative to the carrier frequency.

What all this means is that whether musicians take advantage of TRIDENT’s unique synchronous modulation capabilities (which they, of course, should), or just treat it as three wide-range analog oscillators, TRIDENT offers a vast variety of dramatic sonic textures.


  • Three precision analog oscillators with dedicated 1V/Octave inputs and coarse control ranges of 20Hz to 20kHz and modulated ranges of 0.01Hz to 25 kHz.
  • Main Carrier oscillator with simultaneous triangle, sawtooth and pulse waveforms, with exponential and linear frequency modulation and pulse width modulation.
  • Main Carrier oscillator hard sync input
  • Modulation Oscillator 1 with selectable triangle, sawtooth and pulse waveforms with exponential frequency modulation, variable symmetry and symmetry modulation, and variable Zing level and Zing level modulation.
  • Modulation Oscillator 2 with selectable triangle, sawtooth and pulse waveforms with exponential frequency modulation, variable symmetry and symmetry modulation, variable Zing level and Zing level modulation, and variable phase and phase modulation.
  • Both Modulation Oscillators with independently selectable options to sync to the main oscillator and track the main oscillator
  • TRIDENT features solid construction, with thick aluminum panels, solid aluminum knobs, and quality components throughout.
  • TRIDENT is 30HP wide and 25mm deep.
  • Power requirements (max): 250mA +12V, 225mA -12V. Reverse polarity protected.

Pricing and Availability

TRIDENT will be available this spring at a suggested retail price in the US of $599.00.

3 thoughts on “Rossum Electro-Music Announces Trident Multi-Synchronic Oscillator Ensemble

  1. Looks like this will be fun if an ergonomic nightmare. All of Dave Rossum’s designs have been great and the expanding range of modules offer a fascinating view of the world.

  2. ?…I’m imagining pretty FM(or VPM ala org) tones with some nice chorusing?

    sync w/ analog ring mod is for sure nice! although with analog oscs don’t you have to worry about frequency locking of oscillators that are close?, but maybe this ‘sync’ is taking advantage of that.

    this seems the kind of thing I’d love to see in a (mostly) digital (sem-ish ;)) modular – you know like the total package of some kinda sequencer (aka stepped data recorder) 😀 …some morph able filter (seems like good practice to zing shape them!) and ‘complex’ loop able envelope generator (envelopes created via drawing and sliders are nice)

    and why announce if no sound examples…?

  3. Wow! So many amazing Eurorack modules. The Trident definitely rises to the top of the list of modules to save up money for. I always thought I would have a matched pair of oscillators/sound sources in a Eurorack synth, but with dreaming of the e352, AFG, CS-L and now the trident, if I can eventually acquire 1 of each, I’ll be very happy!

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