The American 5 Dynamics, originally released in the 70s, is a fet feedback type compressor. Equally useful as a tracking, mixdown or program compressor/limiter, the A5D utilizes "vintage" dynamics control and an easy to use multi-function control set. It delivers dynamics control behavior unlike VCA feed forward compressors so common today. American 5 Dynamics makes use of the 2510 and 2520 op-amps and manages to sound clean but with character without being weak and harsh.

What’s in the library programs
- ULTIMATE proprietary technology in sampling and programming for superlative audio quality
- 4 sample rates: 44.1 - 48 - 88.2 - 96kHz
- Nebula4 and Nebula3 Standard AlexB skin

Spec.
- Compressor 2:1 and Limiter 20:1
- Stepped release time: 0.1 - 0.5 - 2 - 2.5 sec.
- Internal sidechain High Pass filter
- External sidechain control (Nebula4 only)
- Dry/Mix continuous control
- Line Out module with G.Drive

This program library works in licensed Nebula3 and Nebula4, NOT Nebula3 1.3.505 or N4-Player

Note for MAC users:
From Acustica Audio: "After several tests, we have detected that our products do not run correctly in the Rosetta 2 mode and we recommend using always application with a specific build for Silicon computers."
To use ULTIMATE libraries on MAC computer you need to upgrade to Nebula 4.5 (rev. April 2022) also.