It offers VCA and Opto models that can be run in a Warm or Smooth mode, and a Program Dependent Envelope (PDE) to decrease pumping and increase loudness. High and low cut filters in the side chain can be used to make frequency dependent compression. The compressed signal can be mixed with the uncompressed one, and that can be used to create upward compression. Three versions are available: stereo, stereo with side chain, and mono with side chain. There is no latency, which makes this the ideal tool for real time performance in the studio or on stage.
The GUP-1 is based on the compressors of the Golden Audio Channel, and is made to meet the demand for an easy "go-to" compressor plugin with side chain support.
For more information, visit their web site at www.kjaerhusaudio.com.