If you took any time searching around for maybe 2-3 mins, you would have found your answer. You just need to download fmod.dll which can be found at esf-world.de and put it in your HL folder.
Also you may need to rename it to fmod.dll since I think esf-world names it something weird. If you need more specification, take a quick look around the forum, you'll find your answer.
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