Eventide Ultra Harmonizer DSP 4000

One of our favorite external effects processors in the studio, and we’re sure many other engineers in the industry could agree, is the Eventide Ultra Harmonizer DSP 4000. From processing vocals & instruments to radical sound manipulation and design, the DSP 4000 has been a staple in the recording & post industry since the mid nineties.

The timeline of the Ultra­Harmonizer originally dates back to 1975 when Eventide first released the H910 which became a studio standard for its unique pitch & delay processing & effects. Sometime later, the H949 was released. Eventually, the H3000 series was released, becoming the industry standard due to the massive range of uses it possessed all at a 16­bit res, 44.1kHz sampling rate capturing a frequency response of 5Hz to 20kHz. In the late 90’s, the DSP 4000 was introduced as an upgrade to the powerful H3000.

The DSP 4000 is either a dual mono or single stereo channel unit. It has 2 XLR Ins/Outs, AES In/Out, SPDIF, and Midi In/Out. Inside the DSP 4000, there are dozens of audio environments to choose from with hundreds of built in user friendly presets from ghostly voices, tape slowdown, to vocal doublers, compression and more.

You can also write totally new user­programmable effects algorithms by linking over 130 different internal modular effects together. User presets can be easily saved and accessed to and from either the DSP 4000 or an Eventide memory card. All presets and effect parameters can be programmed to sync to midi, which is great for delay and modulation effects. You can also plug in a midi keyboard to the DSP 4000 to trigger and manipulate effects as well.

In addition to effects and signal processing the DSP 4000 also has a multi sampler option with two different sampling ranges. We found the sampling function is real good for looping fx’s, delays, creating harmonies and new melodies. Do you need to throw a big bag of tricks into your track, but are board by doing the same old thing in your computer. Give us a call.


The Eventide DSP 4000 is a legendary rack-mounted digital signal processor known for its versatility and stunning audio effects. Here’s an overview of its key functions:

  1. High-Quality Effects Processing: The DSP 4000 is a powerhouse of effects processing. It provides a wide range of effects, including reverbs, delays, pitch shifting, harmonizing, chorus, flanging, phasing, and more. Its high-quality algorithms ensure that your audio signals are processed with exceptional clarity.
  2. Presets and Customization: The unit comes loaded with a library of factory presets, making it easy to access a variety of sounds and effects. Users can also create and save their own presets, tailoring the DSP 4000 to their specific needs.
  3. Multi-Channel Processing: The DSP 4000 supports multi-channel processing, making it suitable for both stereo and multi-channel applications. It can be integrated into a variety of audio setups, from music production studios to post-production for film and television.
  4. MIDI Integration: The unit features extensive MIDI control options, allowing for seamless integration into MIDI-based setups and workflows. This enables real-time parameter control and synchronization with other MIDI equipment.
  5. Patch Bay and Routing: The DSP 4000 provides a flexible and intuitive patch bay that allows you to route and connect the various effect modules and functions in a way that suits your specific needs. This makes it versatile for a wide range of audio processing tasks.
  6. Real-Time Control: With its intuitive user interface, the DSP 4000 offers real-time control over parameters, making it easy to tweak effects and create dynamic, evolving soundscapes during performances or recording sessions.
  7. Upgradable Software: Eventide has released various software upgrades over the years, enhancing the unit’s capabilities and adding new effects algorithms. This means that the DSP 4000 can adapt to changing audio production needs.
  8. Spectral Analysis: Some versions of the DSP 4000 include spectral analysis tools, allowing for detailed examination of audio signals and the application of effects based on specific frequency ranges.
  9. Dynamic Effects: It offers dynamic processing features like compressors and expanders, making it useful for controlling the dynamics of audio sources.
  10. Pitch and Time Manipulation: The unit excels at pitch shifting, time stretching, and harmonizing, making it a valuable tool for creative audio manipulation.

The Eventide DSP 4000 is a versatile and revered effects processor that has been a staple in professional audio production for years. Its combination of high-quality effects, MIDI integration, and real-time control makes it a must-have for musicians, engineers, and sound designers seeking top-tier audio processing capabilities.

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