Okay, check that! I've listened now!
I don't think that was the sound I was expecting as dbx pumping.
At the very end I hear this very faint squeal.
I don't hear dbx pumping.
I think the playing is really good for a short clip.
The sound amost sounds like your fingers wiping across the strings very slightly at the end.
If it's electronic in nature, I'd venture a
guess that this sounds a little like a capacitor discharging! Don't ask me how I know this, I don't, but that's what it strikes me as,... as noises go.
Don't sweat dbx pumping as an issue. I don't hear it on this clip. Also, don't sweat this of most miniscule abnormal sounds on this track. I don't think it's anything that would be noticeable in a full mixdown in context. If all the tracks did this constantly, it might be worse, but for now it's negligible.
There's a lot more horrendous sounding recordings I've heard online that would cause me to worry, a couple of my own included. This isn't one of them!
Dbx pumping would be like a buzzing or fuzzy envelope around each note. This "abnormal" sound seems to squirt off a little bit at the end, just after the guitar clip concludes. Hence, it's my somewhat farfetched guess that it's a capacitor discharge noise.
I'd be more concerned if it was a more highly noticeable sound that permeated the mix. As is, the guitar clip sounds fine.