I've just recently bought this game, and I downloaded some neat soundsets from Sorcerers.net but how do I install them? I can't seem to find the right directory. (Please note to those of you who yell at people for not using the search feature I did and found nothing)

Copy the soundsets into the sound or sounds directory. It's so simple.

There should be a folder called sounds in your BGII folder just unzip them into there.You then can use them by going into the customize sub-screen if you've already started a game. You can't the NPC dialogs though only the characters you create.