The DPR-504 is a 4-channel noise gate.

Each channel features:

• A parametric key filter with key filter listening.
• Simultaneous key level and threshold metering with average and peak metering.
• A gate status LED.
• A RELEASE/HOLD control (hold tracks proportionally with release times).
• Attack switchable auto/fast (auto tracks signal dynamics for optimum setting).
• Link (links two channels together).
• Key source allows external triggers.

The Range switch selects between 7OdB and 2OdB gating depth to provide alternative release profiles.

The unit features electronically balanced inputs and outputs.