He's using the right program, he just doesn't know how to use it right.
Slayer's hurting my ears, and use other drums then the default ones.
Atleast change slayer's default preset a little to your liking.
It plain sucks. This is not a hate comment, this is simply the truth.
Whatever program you are using.
never use it again! I get what your trying to do with the song but the instruments sound so bad it hurts. I would try and get yourself a better program and perhaps it would come out better.