Whilst I know good sounding music when I hear it, the term PRaT always has an artificial ring to me - but I am another who does not really know what asoects of the music it is seeking to describe.
Never understood this myself - doesn’t make sense to be right speed, as you can have two recordings of the same piece of music played at different speeds. Perhaps means is the speed constant? Of course, played by humans it might not be ss recorded - and some music may deliberately gradually increase or decrease speed. With analogue sources the associated pitch variation would give rise to ‘wow’ if short timeframe, but longer timeframe would be noticeable as gradual ‘sharpening’ or ‘flattening’ of notes. However that only applies to sources - what about amps?
I take this to be the system in some way emphasising the rhythm, making it more prominent (though indeed some music is not obviously rhythmic, and other music would be spoilt by teasing out the rhythm like that). Could perhaps be done by emphasising frequency band where the some percussion lies, perhaps snare and kick drum. Also mag occur with speakers that have ‘colouration’ with the same effect. This is the area about which I am suspicious when anyone says the system makes music more exciting.
This is the only one I am more certain I understand: think this is to do with minimising ‘bluring’ of sounds, notably an amp having a very fast ‘rise time’, and equally across the frequency spectrum, so that a percussive sound, whether snare drum or stringed instrument plucked with a hard plectrum or hit with a hammer reaches maximum loudness as quickly as it does live, not taking a fraction of a second longer and so sounding ‘softened’.