Ensoniq DP/4 Parallel Digital Effects Processor Vintage Rare DP4. 
The Ensoniq DP/4 is a digital effects processor that was introduced in 1994. Its four independent effect processors allow for versatile routing and effects processing, making it an essential tool for studios, live performances, and post-production environments.

The DP/4 offers a wide range of effects including reverb, delay, chorus, flange, phaser, distortion, EQ, and more. These effects can be used independently or combined in various ways to create unique and complex effects chains. The unit also includes an easy-to-use interface with a large LCD display, making it simple to navigate through its various features.

One of the standout features of the DP/4 is its flexible routing capabilities. Each of the four effect processors can be routed in a variety of ways, including parallel, serial, or mixed routing, allowing for infinite possibilities for effects combinations. This flexibility is particularly useful in studio and post-production environments, where sound engineers need to create unique and customized effects for specific projects.

Additionally, the DP/4 includes a wide range of inputs and outputs, including MIDI, AES/EBU, S/PDIF, and balanced XLR connections, allowing for easy integration into any setup.