Cannot Hear Ghosts Breathing

How do I configure my audio in such a way that I can hear ghosts breathing. I have been playing this game for a long time (at least 2 years, even when suba had the game) and have not found any solutions to this problem. I have used both headsets and speakers for the game and they have not worked. If there is something specific that a computer has to have or something I would like to know. I can pinpoint footsteps, gunshots, etc. but I have never once heard breathing.
Thank you very much for your time :)
Sincerely,
narnialuver (in game: tounge_punch)

PS
I have a very new computer that I recently built... this problem occurs on both my new computer and the old one that I used to use.

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