DP/4

The Ensoniq DP/4 is a 24-bit digital multi-effects processor built around four fully independent effect units, each able to run any of 46 algorithms including reverbs, delays, choruses, flangers, pitch shift, rotary speaker, and VCF-distortion. Its 4-in/4-out architecture with an internal digital patch bay and submixer lets you process up to four separate signals at once in any mono or stereo, series or parallel routing. It occupies two rack spaces and ships with 400 presets; a revised DP/4+ followed in 1995.