I've been working on a sound update for some time now. Making a few of my own and ripping some from other games.
The link below will direct you to MegaUpload, where you will download a '.rar' file, which you will need to extract into your 'Data' folder.
If you do not have WinRAR, download it here.
Not all sounds are changed, but many noticeable ones are. Multiple beta builds of this update will be released in the future, until a near complete overhaul is completed.