Excellent
Top quality. Write a fully CD of this stuff with a few technical instrumental songs and a bit better mixing and your good to go.
I actually thought this was real instruments at first, before I listened closely. The vocals are top notch, especially the second ones that come in, though those second vocals could have used a bit better mixing imo.
The electric guitar was good. I could it tell it was fake when I listened for it but it was spars and unprominent in this track so it was ok, though I would suggest having a pro guitarist lay down some tracks for u if u do a composition like this again. Actually that goes for all tracks, but of course you must work with what you have available.
Could use a bit better bass sound.
Finally, nice job with the piano. Nice melodies and it sounded damn natural in this track even though I can't think of much (any) black metal that features piano (not that I know a great deal of black metal).
Oh, and il be really embarrassed if it turns out you did use real instruments :)
GJ dude.