Sorry that won't work for my purposes, I am talking about widening a MONO track, M/S processing only works with something already recorded in stereo. CMX works like a chorusey/delay sort of plugin that copies the sound and shifts various permutations of it aroun the stereo field to widen it. It sounds unnatural if you get too carried away but is really useful in small doses to stop background vocals and lead vocals from fighting for the same space if you are stuck without a doubled background vocal line and only have one take of it.