Triadex Muse

Triadex Muse Image
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The Triadex Muse is a sequencer-based synthesizer from the early 1970's. It was designed by Marvin Minsky and Edward Fredkin, both MIT professors with an interest in artificial intelligence. Intended as a compositional aid, the Muse is unlike most synthesizers out there, which may have contributed to its poor sales. Even so, it managed to make its mark upon the world of music, especially among the avant garde.

In lieu of a keyboard, the Muse uses eight 40-position slider switches which control a series of digital logic circuits using complicated algorithms (the Muse is considered one of the first digital sequencers). The binary output from the logic circuits is fed into a digital-to-analog converter (DAC), and the output from the DAC is fed into a simple VCO. The result is a sequence of notes which, depending on the slider settings, can take years to loop back around to the beginning!

Triadex Muse Image

Operation of the Muse is not particularly intuitive, yet it is not too difficult to get started. Four of the sliders control the interval of notes, and the other four control the overall theme. A bar-graph lamp display near the sliders shows the status of the logic gates. Another set of sliders control the volume from the internal speaker, the tempo of the sequence, and the pitch. Additional switches allow you to start the sequence from the beginning, step through it note-by-note, or substitute a rest point in place of the lowest note. The owner's manual provided slider settings for example tunes, as well as templates where the user could log settings which had resulted in interesting sequences.

Triadex Muse Image

The Muse retailed for only a brief period of time in the early 1970's, and is considered extremely rare. The exact number of units sold is unknown, but is thought to be under 300. Even more rare are the accessories Triadex produced to go along with the Muse, including an Amplifier module (with an external speaker), a Multi-Muse Cable (used to daisy-chain multiple Muses together), and a Light Show module, a color organ whose 4 colored lamps blink in time to the signals coming from the Muse. All these accessories shared the Muse's unique design styling, too.

While it's very difficult to master, and nearly impossible to get it to play a specific song, the Muse offers nearly endless potential for random music generation. Set the sliders, switch it to automatic mode, and it will produce all sorts of bleeps and bloops. Add the Light Show module to the mix, and it becomes a visual spectacle as well. It's too bad the Muse used a proprietary I/O for communicating with other Triadex products, as it means the Muse can not be used to control any other synthesizers.

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Demos & Media

TRIADEX Muse, Light show and Amplifier module
Triadex Muse Pyramid


Polyphony - Monophonic
Multitimbral - None
Oscillators - 1 VCO
Waveforms - Square
LFO - 1 LFO with tempo control
Filter - None
Envelope - None
Effects - Tempo, Pitch, Fine Pitch, Rest
Sequencer - More than 14 trillion possible sequences
Tracks - One
Patterns - None
Songs - None
Arpeggiator - None
Keyboard - None
Memory - None
Control - Proprietary In/Out for daisy-chaining multiple Muses
Date Produced - 1972


Images from Encyclotronica

Review by Adam Vaughn

Reviewed July 2012