The Six-Trak was an analogue synthesizer manufactured by Sequential Circuits in San Jose, California and released in January 1984, notable for being one of the first multi-timbral synthesizers. It is a six-voice polyphonic synthesizer with one oscillator-per-voice equipped with MIDI, arpeggiator and an on-board six-channel digital sequencer which allows individual or grouped track recording. It was designed as an inexpensive and easily portable 'scratch-pad' machine for trying out arrangements. The synthesizer has both a polyphonic and a unison (monophonic) mode.

The Six-Trak is prominently featured and can be heard on the 1998 minimalist space music CD release The Dream Garden, by musician/composer Dane Rochelle. More recently it has been used by composer Christopher de Groot for the 2012 soundtrack to Australian feature film "Sororal".

The synthesizer used CEM3394, a complete monophonic analog synth chip manufactured by Curtis Electromusic Specialties, which was used in other synthesizers made by Sequential Circuits such as the Multi-Trak, Max, Pro-8 and Split-8. The Six-Trak contained 6 chips for 6 voices of different timbre program.

Notable users Atrax Morgue Benny Blanco Gui Boratto Chromeo Cirrus Luis Delgado Guerilla Toss Helios Creed Mitch Margo Moka Only Oneohtrix Point Never Ruki Vverh! Solitaire Chris Tabron Thus Owls Überzone

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