SQ-80

The Ensoniq SQ-80 is a hybrid synthesizer that was produced in the late 1980s as a development of the company's earlier ESQ-1. It generates sound from three digital oscillators per voice, drawing on a ROM library of short digital waveforms, and shapes them through analog low-pass filtering across eight voices of polyphony. Its 61-note keyboard responds to velocity and polyphonic aftertouch, and the instrument includes an onboard sequencer and a built-in 3.5-inch floppy disk drive for storage.