Fix for Gamersgate & Beamdog & Steam Versions Audio Problems : For installation, unpack to game main folder. Optionally, backup old gf_sounds.grp and main.fat. This will give you Russian voice files ; which fixes missing audio (gunshots, etc.) & issues with audio (sound that disappears, etc.). Cutscenes remains in english, there are subtitles for dialogues. Also, it adds a lot of voices acting.
Extract the archive and copy-paste its content into the main folder of the game.
Don't forget to install unnoficial patch from Wesp5 AFTER the sound-fix : Moddb.com
The community patch will replace all of the voice acting in the cutscenes with English voice acting. Also, it adds a lot of voices acting.
There are subtitles for dialogues.