If you can find one, the JD-990 was the rack-mount version of the JD-800.
It's also semi-compatable with the early JV-80/880 series.
It's a fine sounding box, but be warned, it's max. polyphonly (spelling?) is 24 notes, and can drop to 8 notes when a patch uses uptp 4 tones.
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The Sonic Energy Authority - a sound investment
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The Sonic Energy Authority - a sound investment