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SQ-80
Ensoniq / Synthesizers

SQ-80

1987–1990

The Ensoniq SQ-80 is a hybrid digital/analog synthesizer released in 1987 as an evolution of the ESQ-1, using Cross Wave synthesis that pairs 75 digital waveforms (including sampled transient-attack waves) with analog filters. It offers eight-voice polyphony with three oscillators per voice on a 61-note keyboard, and was the first Ensoniq instrument to feature their Poly-Key polyphonic-aftertouch keyboard. A built-in eight-track sequencer plus a 3.5-inch disk drive made it a compact workstation that became a cult favorite among vintage-synth enthusiasts.

Overview

The Ensoniq SQ-80, released in 1988, combined digital waveforms with analog Curtis filters in a hybrid architecture that delivered the best of both technologies. This 61-key synthesizer offered eight-voice polyphony, three oscillators per voice, and a distinctive wavetable approach using Ensoniq's proprietary "Transwave" technology for evolving textures.

The instrument's modulation capabilities were extensive, with multiple envelopes, LFOs, and a modulation matrix. The built-in sequencer provided eight tracks of recording. The SQ-80's sounds—particularly its strings, pads, and basses—appeared on numerous late-1980s and early-1990s recordings.

Ensoniq manufactured the SQ-80 until 1990, when the VFX series superseded it. The instrument competed against the Korg DW-8000 and similar hybrid synthesizers. Today, the SQ-80 is appreciated for its unique sound character—digital clarity filtered through analog warmth—and its role in Ensoniq's innovative synthesizer lineage.

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