Basically, it's a dual-engine unit, with the processors working in series, parallel, or series-feedback. Sound-wise and capability-wise, it may not be up to par with current units such as the TC FireworX/M2000 or the Lexicon PCM-81/91... but for a few hundred buck, it makes a nice complimentary grit/color box.

Creative possibilites with the DP/2 are actually quite numerous. This is partly thanks to the fact that some algorithms combine two or three effects (ie. EQ-Panner-DDL, Pitch-Shift-DDL, VCF-Distort), making it possible to actually chain 4 or 5 effects together if you use certain combinations. I personally find the DP/2 excellent for "sci-fi" treatments of pad-like synth sounds. For example, a Wavestation pad running into the DP/2, VCF-distortion and pitchshifter in a feedback configuration yields some nice guitar-amp feedback-like tones. Certain effects, such as the pitch-shifter, also have LFO's as part of the parameter selection, making these types of sounds possible. Another phaser-pitchshifter combo acheives a sond similar to the "whale probe" sound from Star Trek IV... and so on.

Definitely a useful sound design tool, equally at home in keyboard and guitar rigs, no doubt.

 Ensoniq DP/2 Specifications: