I really haven’t noticed delays on the main VU on my controller, but even if it is, what we are looking for is the peakvolume, so a few ms doesn’t really matter. I don’t have channel-VU’s on my controller, but that doesn’t set me back in any way.
Should be possible to add a separate MIDI unit with 4 VU’s on it and map those to the decks… does anyone know about such an unit?