The Swarmatron is an analogue synthesizer or electronic musical instrument that uses a ribbon controller rather than a keyboard. It is noted for its use of multiple oscillators that are linked through a 'swarm' control, giving its distinctive sound and method of playing.
The Swarmatron is a fingerboard synthesizer like the Trautonium or Tannerin. A finger is placed or slid from side to side along a ribbon controller, controlling the pitch. Glissandi are obviously easily achieved, or careful finger placement may be used to play discrete notes.
The distinctive feature of the Swarmatron is its use of eight individual oscillators, under a single control. These oscillators produce an equidistant chord, where their spacing is under the player's immediate control. There are two ribbon controllers: the larger controls the pitch in the obvious manner, the second is used to control the spacing of the oscillators when in 'Swarm' mode. A large central knob on a rotary control may also be used to control this swarm.
The oscillators may also be switched on and off individually by a row of switches. With all but one switched off, the instrument becomes a simple ribbon-controlled monophonic synth, capable of the usual glissandi. Using combinations, and adjustment of the range control, allows a non-equidistant swarmed chord to be produced. The oscillators may also be preset to the usual chord intervals of major thirds etc.
The pitch control also controls a low-pass filter. This may either track the main pitch, or may be controlled by the second ribbon.[note 1] With the sawtooth wave of the oscillators, this tracking filter controls the sound of the instrument.
Like the Persephone, the tuning controls for the ribbon's base frequency and overall range have such a wide span that the ribbon controller itself is unlabelled, although some players mark note positions on the ribbons for a piece.
There are no facilities for MIDI. However there are three analogue 0-10V Control Voltage (CV) inputs for pitch, filter cutoff and swarm. With the use of a standard MIDI to CV converter, the instrument may be controlled from a sequencer or other MIDI controller.
The Swarmatron was developed by Dewanatron, the Dewan cousins, Brian and Leon. They are still hand-made by the Dewans, explaining their high price-tag. Previous instruments such as their Melody Gins and Dual Primate Console have also used the same principle of multiple, interacting oscillators. These instruments also show the Swarmatron's retro styling of dark wood cases with hammer-finish green paint. Knobs and switches also show a distinctly retro influence. Front panels labels are deliberaterly minimal, controls being labelled with single letters rather than words.
Dewanatron sell their Swarmatron through Big City Music of Los Angeles. At a 2011 price of $3,250,[note 2] the instrument is limited to those with deep pockets. From 2004 to the start of 2011, only nine had been sold.
Notable appearances 
Derived instruments 
The Swarm, a software drone synth for the Mac and Windows has been produced, inspired by Swarmatron and Trent Reznor's soundtrack. Although this emulates many features of the Swarmatron, and adds MIDI control, it does not include the hardware features of the ribbon controls.
- In this mode, swarming is controlled by the central knob.
- The price rises to $3,450 with additional fine-tuning controls.
- "Swarmatron demonstration" (MP3). Dewanatron.
- Paul Nagle (June 2011). "Dewanatron Swarmatron". Sound On Sound: 40–44.
- "Mariqueen Maandig of How to Destroy Angels performing on a Swarmatron".
- "About Dewanatron". Dewanatron.
- Nick Paumgarten (2011). "Swarm". The New Yorker.
- "Melody Gins". Dewanatron.
- "The Dual Primate Console". Dewanatron.
- "Dewanatron - Swarmatron". Big City Music.
- "Free Mac Synthesizer, The Swarm, Inspired By Trent Reznor’s Swarmatron Synth". Synthtopia. 4 March 2011.
- "The Swarm". reFuse Software.
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