AddEffectVoice

[Homicide13]

What are the "EffectFile"s in the function

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void AddEffectVoice(string& asVoiceFile, string& asEffectFile, string& asTextCat, string& asTextEntry,
bool abUsePosition, string& asPosEntity, float afMinDistance, float afMaxDistance); 


?

I've looked through every one of these functions in the main game but none of them use this option. Does anybody know what kind of file is it even, and what does it do? There is an "effects" folder in textures folder, but this only has one file in it: colorconv_sepia.tga, which is just a 256x1 file that has a white to sepia gradient across it. I tried running a test map using this image file but nothing happened (as far as I could tell).

If anyone has any idea as to what this does any help would be very much appreciated!