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It also doesn't help that it seemed like Half-Life had maybe a dozen ambient sounds for the entire game.
http://www.netshark.us/valve/sounds/ambience/http://www.adminmod.org/manual/Admin_Mod_Reference/Half_Life_Sounds.htm#ambienceI count quite a few more...
Certain ambient sounds were used much more than others.
But comparing both games. SS2 seems to have smoother shading than Half-Life. Also, even at maximum light it's still a tad darker than Half-Life.