The Eventide H3000 Ultra-Harmonizer has found its way into almost every professional studio in the world. It's range of effects and upgradable presets and algorithms have allowed the H3000 to enjoy a long successful life. The introduction of the Mod Factory option allows modular analog-like contruction of effects presets.
The H3000DSE has 21 algorithms with 600 standard presets, including the presets from the H3000DSX. The H3000 offers a variety of effects, including true stereo pitch shift, pitch-correcting diatonic pitch shift, linear-predictive vocoder, six voice polyphonic synth, and a 19 waveform LFO function generator with full control via a comprehensive MIDI implementation. The multi-shift algorithm allows pitch shifting over a six octave range great for mangling and processing audio. Reverse and layered pitch shift are also available. Also available are instant phaser, multi-band delays, swept comb filter, and ultra-tap delay. The built-in waveform function generator operates like a synthesizer's LFO - its 19 periodic or triggered waveforms plus pink and white noise are assignable to most all parameters of the effects program. It's possible to create MIDI triggered effects, unique chorus modulations, autopans, and tremolos.
Editing the effects programs is fairly straight forward, and greatly assisted by the well thought out user interface. The front panel features a large green backlit 80 character LCD display with four soft buttons. Parameters can be edited with the data entry knob, up/down buttons, the numeric keypad, or via MIDI. Dual ten segment bar graph meters aid in setting input levels.
I find the H3000 an indispensible tool in the studio, and is exceptional on guitar, synths, and even drums. The delays are superb and the mod factory option adds a lot of flexibility and yields unique sounds. The H3000 is starting to show its age though, having been been replaced in the Eventide line-up with the DSP4000 and the brand new multi-channel 24bit/96khz Orville. Nonetheless, Eventide has done a great job supporting the unit and still makes the broadcast, sampler, and mod factory options available.

H3000 Preset List
ROM Upgrade Instructions
Eventide Harmonizer Website