The HERCHILD Model 670 is a 2-channel Tube-based Variable-Mu compressor meticulously replicating the classic Fairchild design. With 22 valves and 9 transformers, it operates at high voltage for professional results. Features include 6 Attack and Release times, a unique progressive ratio control, and a side chain filter with 4 selectable frequencies. Additionally, it offers 4 operational modes: IND, LINK, LAT VERT, and LAT VERT LINK, catering to various stereo control preferences.