Preview is outdated but it shows the general idea.
Welcome to by far my most ambitious project to date...
PAYDAY Combine VO Sound Pack
Containing voices from PAYDAY law enforcers and (in the alternate version,) Black Mesa grunts. Contains over 1000 different sound files.
Not only does this heavily modify the sentences.txt it also replaces most scripted map lines, some with specific lines you won't hear anywhere else. For example, the cops knocking on Barney's door in d1_trainstation_01 and the two cop's conversation in d1_canals_01a.
Each version of the mod has an alternate that adds a mask filter to the voices.
Installation instructions and credits included in readme.txt
Preview for 1st alternate
Preview for 2nd alternate