Channel Matrix 2×2 is a free routing VST plugin developed by rs-met. Compatible OS(s): Windows.
Channel Matrix 2×2 is a plugin which lets you matrix-multiply the signals of two input channels in order to obtain another two signals which will appear at the two output channels. Example uses are mid/side encoding/decoding, mixing stereo to mono, switching channels left for right, boosting or attenuating signals, inverting signal polarity, etc.
http://www.rs-met.com/