The Swiss Army knife of dynamic audio processing. D4 breaks up audio levels into "processing zones" so you can control different levels exactly as needed.
It can be a Compressor, Expander, Compander, Leveler, De-esser, Ducker, Dyn. Restoration and everything in between.
But unlike the famous Swiss multifunction tool, D4 can use its arsenal simultaneously.

The Detailer is a stereo mastering tool or final mix plug-in for the master fader. It represents a new method of increasing the perception of detail while still allowing increased loudness in the final mix. It is a combination of three band limiter and dynamic widening psycho acoustic processing. Roger Nichols has fine tuned the process to produce the most effective results with the least amount of adjustments.

The Finis 3 is a 3-band peak limiter that is a new approach for multi band peak limiting due to RNDigital’s superb FIR filter technology providing an excellent separation of three bands without phase shift on the crossover frequencies. The Finis 3 does consist of 3 independent peak limiters operating separately on each of the bands as well as one central peak limiter controlling the sum of all bands. The Finis 3 is based on RNDigital’s excellent Finis Brick-Wall Peak Limiter and FIR Filter Band-Splitting Technology.

Frequal-izer builds a complex FIR (Finite Impulse Response) filter to your specifications. See the results of your EQ with the built-in spectrum analyzer. Frequal-izer will not color your audio with the introduction of non-linear phase shift.