Pros
Readds some of the ambient music
Cons
Missing quite a few tracks (safe room audio does not play)
Still uses L4D2 incap, death, monsterswithout
BIG error during the finale: the ambient (before you summon the horde) music will always play. When I called for Rescue 7, no "Rescue is coming, prepare yourself" music played, no horde music, and when stepping outside to relocate to the barn, the same ambient prehorde music played, despite being chased by fleasheaters.
Its a step in the right direction. It DOES contain the starting music, but valve I think readded that anyway, without the need for the mod. Still, the Ambient "quiet" sounds as you progress through the campaign is enough to at least meet this half way.