Yeah this is better than the original mainly because the hardware it was originally played back on was garbage. This has a lot more clarity to it and that as a side effect lets you hear everything the way you should have been able to.
I am currently playing through this game and I just got to this area. This is like my third run through the game now I think. twice on the emulator and now once on the real deal. Still one of my favorite tunes from the game.
Subterranean Hell from Castlevania Dawn of Sorrow, don't know why, but your song sounds better than the original.
Please contact me if you would like to use this in a project. We can discuss the details.