mf = mezzo forte, or moderately-loud, referring to how the instrument was played when the samples were recorded amp = may refer to the instrument being recorded through an amplifier, e.g. a guitar patch can be either direct or amped, or it could indicate a patch whose amplitude is controlled by the mod wheel
p = pianissimo, referring to the low-velocity articulation played for the samples (Italian for "soft")
mv indicates a patch where the modwheel controls volume, useful for orchestral sounds
mw = mod wheel, indicates a patch where the mod wheel does something, usually a filter
vm = (guess) refers to the vector mixer, which lets you crossfade between the 4 elements
1v, 2v, 3v 4v, refers to the number of stacked voices or velocity layers
rt = release trigger, meaning a release sample is played on release of a note
RGC is the name of the one-man company that created several of CW's synthesizers, and the initials of its designer, Rene G. Ceballos. He worked on Rapture, Pentagon and Z3ta+ as well as Dim Pro (and several others)
CB, RN, FG = the initials of various sound designers