Not bad at all if you ask me.

On a big layout DCC sound can become a bit odd because it's only the loco sounds that are apparent when on the real thing it is also the coaches, wagons, wildlife and general hubbub of a railway environment you hear.

So using real sounds on your videos synchronised with appropriate train movements is perfect.  Just a pity the sorts of trains you are running are from so far back that the high quality recordings we have of modern trains aren't so available.  But nice to hear the clacking sound again of an EMU sat at a station.