via this auction"As its name suggests, the Jupiter-8 is an 8-voice polyphonic analog synthesizer. Each voice features two VCOs with cross-modulation and sync, pulse-width modulation, a non-resonant high-pass filter, a resonant Low-pass filter with 2-pole (12 dB/octave) and 4-pole (24 dB/octave) settings, an LFO with variable waveforms and routings, and two envelope generators (one invertible).
Noteworthy performance features include adjustable portamento, a hold function for making sound design easier, a versatile arpeggiator with DIN-sync and external analog clock input connectivity, assignable pitch-bender, instrument layer and split modes, robust load and save functionality for its 64-patch memory, built-in XLR outputs, and—in addition to legato and polyphonic modes—the Jupiter-8 includes a powerful unison mode.
A Z80 CPU was used for managing storage of patches, scanning the keyboard, display, and buttons, port handling, and taking care of the auto-tune function among other things. The VCOs were discrete. The VCF was based on the Roland IR3109 IC (also used in the Jupiter 6, MKS-80 rev 4, Juno 6/60, JX-3p respective filter circuits). The VCA was the BA662. The envelopes were hardware generated by the Roland IR3R01 chip (also in the Juno 6/60), and are much faster than software generated ones in the subsequently introduced Jupiter-6 and MKS-80 "Super Jupiter"."
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