The Eventide 4000 series Ultra-Harmonizers are multipurpose programmable digital audio signal processors with pitch change capability. They are considered by some to be the greatest in a line of pitch changing special effects units stretching back to before most audio manufacturers ever heard of digital.
The 4000s are capable of creating effects you’ve never heard before, with a built-in patch editor to let you create your own effects algorithms.
![](https://cdn.eventideaudio.com/uploads/2021/07/DSP4000-Wide.png)
![](https://cdn.eventideaudio.com/uploads/2021/09/DSP4500-Wide.png)
![](https://cdn.eventideaudio.com/uploads/2021/09/GTR4000-Wide.png)
Features
The different Harmonizers in the 4000 series are optimized for different marketplaces.
Models included:
- DSP4000
- DSP4000B
- DSP4500
- GTR4000
Documentation
![](https://cdn.eventideaudio.com/uploads/2021/06/4000seriesUG-page-001-813x1024.jpg)