Manufacturer Description:
With just eight connections and four knobs, M/S Matrix is an exceedingly
simple yet exceptionally useful module. Quite simply it can
simultaneously extract the mid and side signals from a stereo input
whilst combining a MID and SIDE signal to form a stereo signal.
There are probably way too many handy applications for this device to cover them all... but let's give it a try anyway.
At the most basic, without any additional processing, the module can be
used to control the width of an incoming stereo signal. Moving up the
sophistication ladder, by inserting a filter into the SIDE signal path
and filtering out low end information, you could use it to mono the bass
element of a stereo, which can be useful for everything from mastering a
track for vinyl to ensuring your bass doesn't suffer from phase
cancellation on less than perfect sound systems.
On a similar note, you could apply compression to either the MID or SIDE
signal path, thickening it up and raising its perceived level. Or you
could pump one of them (or both at different amounts) with sidechain
compression. Or saturate one. Or brighten them with EQ. Or you might use
the module as a mixer, attenuator, subtractor, inverter... or
absolutely anything you want - which is both a sneaky way to cover all
the possible applications after all, and a nice way to end this product
description.