“The STC-3 is a precision tool for controlling the stereo width of any stereophonic content.
Use it for expanding the stereo field of synth pads, sound effects or soundscapes or to narrow a track to full mono.
Designed for zero artifacts and natural sound, the STC-3 can be used on a single channel or on the bus processor, for both mixing and mastering.
A large stereo-readout display provides a visual feedback of the used expansion and the dedicated ‘LF Processor’ makes sure that the low frequency content is kept vivid and tight, albeit the stereo expansion.”
Source : RAZ Audio