"Pace", it's importance for enjoyment?

Redkiwi, I like your final test of being "swept away by the music." My wife consistently talks about "the gestalt" of the musical experience whenever we listen critically together. And I agree. The overall experience is what I ultimately listen for - if the experience as a whole doesn't result in being "swept away by the music," it is readily apparent that something is missing from the system. In our case, though, we tend to start with the overall experience, and then objectify to make sure we understand what is causing the good results. If a "new to us" system is not giving us good results at that gestalt level, we tend to simply move on and not expend any more energy on it.

I think we're kicking a dead horse now

Whinee!!!

I whine with pace = P

Nice pace to your last post, Red!
To recap (esp for Sean), I don't believe having AMPLE bass has anything to do with enabling PRaT--usually quite the opposite! It's the high frequency cues from the transients
that signal the ear-brain timing sensoria, no? To the extent that bass fundamentals that develop somewhat later in the harmonic envelope are kept in proper time with their leading transients affects our perception of good PRaT. As it turns out it's easier to design for tight bass response of less amplitude and extension (2-way monitors, especially unported or port-tuned fairly high) than with 3-ways or sub/sat systems, where separate drivers and their associated crossovers, big cabinets, slow-moving larger masses, etc., conspire to lower octaves' "lag" and what we call poor PRaT.
I've heard doubters state that "fast" bass response is nothing but lean bass response. Not necessarily...and that's what I like so much about my current speakers: an exceptionally fast woofer that simply doesn't lag its exceptionally fast mid (VA Parsifal Encores).
How PRaT varies in a digital product I don't even pretend to understand! Anybody shed some light here? Happy 4th! Ern