The four channels operate independently or in stereo pairs. Its multi-segment LED metering displays input/output level as well as gain reduction. The Expander/Gate section features a continuously variable Threshold control as well as a switch for fast or slow release times. 

The Compressor/Limiter section includes variable Threshold, Ratio and Output levels. S com 4's Enhancer switch restores high frequencies that are sometimes diminished by heavy compression. 

This wide-ranging combination of features makes the S com 4 an efficient and versatile audio tool for a wide variety of applications. Its clean and quiet audio characteristics make it ideal where high sonic integrity is imperative.