I have a little trick for vibe glue As most of you guys do, I track using room mics, on every instrument when I split everyone up during tracking. I always put everyone's instrument where they would be if they were going to be playing together in the same room. during mixing, I will take all the room mics, leave in in their respective instrument busses they are already assigned to but also send them out to there own bus. On that bus I will put something like a pie squeezing it moderately, I might even run it as an insert to a verb with a low dampening and a high dry signal on it to add some glassiness to it. The pie does a nice job with this task. I also do not add a whole bunch of this buss in too much on the overall but it seems to vibe things up nicely and helps fill in some voids. But of course if your room sucks it will make your mix worse.