So, two acoustic mixes, one before going through VBC, the next passing through VBC Rack. I've done a quick level match before rendering too to even up. Keep in mind I'm just a bedroom warrior, I don't hold myself as a professional, just a musician that enjoys the hobby. That said, I like to think my experience is of interest to this discussion.
Guitars were recorded with a pair of NT5s. There is VCC and VTM on the tracks before going into VCC Buss and VTM 1/2" tape.
With the VBC, it was going through Grey, Red (no gain reduction) then Mu. On Mu, it was set to mid-side setting, quick attack/release on mid, slow attack, quick release. Only slight gain reduction on each channel, and 0.5 db make up gain on the side (I'm aware this has added to increase in stereo width, but that was intentional).
What I can hear, apart from increase stereo width, is an overall sheen applied to the sound, the track sounds a lot more exciting with different picked notes plucking out nicely but not inordinately, the vocals, which usually have this mid range grating to it that makes it hard for me to find a place for it sounds like it's more part of the track.
Overall, it's gone from something that sounds like I recorded in my room, and accepted the limitations in results, to something that I would be happy to pay for.
I wish this came out 12 years ago, when I first heard of compressors, because I can hear clear as day what changing the attack and release time does to the signal, along with the amount of gain reduction. I feel it allows me to go "ok, this is what I want this to sound like, theory tells me I should start with the knobs here" and the results are what you expect. Not a sludgy mess that I try to EQ again, compress again, EQ again....blah...
Also, it's a cover song, played and sung by me.
Before VBC:
https://www.dropbox.com/s/smcxn7v508wx8wc/San_Celeste-Green_Corn-UNMASTERED.wav
After VBC:
https://www.dropbox.com/s/muq7e8l14dbr0ze/San_Celeste-Green_Corn-MASTERED.wav