SQ-80 Cross Wave Synthesizer - MAME machine

Musical Instrument (Electronic) published 38 years ago:

SQ-80 Cross Wave Synthesizer © 1988 Ensoniq

The SQ-80 is a flagship, 61-key digital/analog hybrid "Cross Wave" synthesizer. Developed as the direct evolutionary successor to the massively popular ESQ-1, the SQ-80 was engineered to push the boundaries of digital wave-sequencing. It combined an expanded digital waveform vocabulary with true analog filters and a premium keyboard mechanism, offering film composers and studio producers a gritty, organic alternative to the sterile, purely digital FM and linear PCM synthesizers of the late 1980s.

The internal sound engine of the SQ-80 features an 8-voice polyphonic, 8-part multi-timbral hybrid architecture. Each of its 8 voices is powered by 3 independent digital oscillators, drawing from an internal ROM pool packed with 75 distinct 8-bit digital waveforms. This library includes standard synthetic shapes, acoustic instrument transients, and Ensoniq's signature multi-sampled, looping "Cross Waves." The true magic occurs when these digital signals leave the chip: they are routed directly through 8 true analog Curtis CEM3379 low-pass VCF chips (24 dB-per-octave with resonance), followed by analog VCAs. This combination gives the machine its legendary, warm, and aggressive sonic footprint.

The physical hardware is built like a tank, featuring a heavy metal chassis, a large, high-visibility fluorescent display (VFD), and an advanced, clicky 61-note keybed that features rare Polyphonic Aftertouch. The front panel also houses a built-in 3.5-inch floppy disk drive for immediate patch and sequence storage. For composers, the SQ-80 includes an incredibly robust, integrated 8-track hardware sequencer capable of storing up to 20,000 notes, backed by full 5-pin MIDI In/Out/Thru connectivity and a stereo audio output pair.

TRIVIA
The Polyphonic Aftertouch Luxury: The SQ-80 is one of a very small handful of vintage synthesizers in history to feature a physical Polyphonic Aftertouch keybed. Unlike standard channel aftertouch (where pressing down hard on one key modulates all playing notes simultaneously), the SQ-80 transmits individual pressure data for each specific key held down. This allows a musician to hold down a lush 5-note chord and add dramatic vibrato or filter sweeps to just a single melody note within that chord.

The "Cross Wave" Transient Hack: Long before modern wavetable synthesis became standard, Ensoniq's engineers maximized the tiny 8-bit ROM space using a technique called "Cross Wave" compilation. They decoupled the initial acoustic striking transient (like the high-frequency "chink" of a guitar pick or the "breath" of a flute) from the sustaining loop body. By combining a digital acoustic attack transient on Oscillator 1 with a gritty, looping synthetic waveform on Oscillators 2 and 3, the SQ-80 could mimic realistic acoustic instruments while maintaining a massive, complex sci-fi edge.

The Hidden "Inharmonic" Waves: The SQ-80's digital ROM includes a selection of intentionally corrupted, intentionally metallic "Inharmonic" digital waveforms. When these low-resolution, blocky digital shapes are driven through the warm, analog Curtis filters, they produce incredibly eerie, industrial, and haunting textures. These became highly sought-after signature sounds for industrial bands, EBM pioneers (like Skinny Puppy and Front 242), and dark synthwave soundtracks.

A Flawless Backwards Compatibility: Ensoniq demonstrated incredible customer loyalty when designing the SQ-80's data architecture. Because it was built on a heavily supercharged version of the older ESQ-1 sound engine, the SQ-80's internal microprocessor and 3.5-inch disk drive were coded to be 100% backwards compatible with original ESQ-1 patches. Musicians could instantly load their legacy ESQ-1 tape backups, cartridges, or system exclusive files into the SQ-80, where they would play back perfectly through the exact same analog filter paths.

CONTRIBUTE
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