Jitter, AIR and USB

[Damon]

A Devialet, a digital source and a pair of speakers. Who has this working properly, please?

...insert emoticon of me holding my hand up and waving it... though when I add up what I've spent on hi-fi I'm a bit disconcerted. And yes, I realize that I'm in at the shallow end of the pool on this point.

Jitter? Never heard of it, and don't even know what street it lives on.
Firmware? I leave it firmly in place and don't think about it or fuss with it.