How to add Custom Sounds to PR

Hello!

I'm new to this Form and I have no Idea where to post that Thread. I hope you are not going to delete this Thread just because I posted it at the wrong place.

Anyways, I need your help. I have the standalone version of PR and I've been playing it sience 3 years now.
BUT (for Singleplayer only,) I want to change some Weapon sounds. The G36 for exapmle.
So I found the Folder with all of the WAV files.

Volume D:>Programs>Project Reality BF2>Mods>PR>Content>objects_weapons_client.zip\wea pons\handheld\gerrif_g36\sounds

There are Indoor, Outdoor (..) sounds of course. At first I only want to change the Outdoor sound.
So I created my own WAV File (my own G36 Sound) and renamed it g36_1p.wav. That way, I could simply Overwrite that sound.
I made Backups of course.

I Booted up PR, loaded a German Map (Lashkar Valley) and My G36 makes no sound. I have no Idea What I have to do in order to hear my custom sound ingame.
I also changed a TWEAK files, to make that sound louder, but that did not work too. I changed that TWEAK file to original after that.
Also, I know about this 'Looping effect' you have to add in order to hear your gun firing in Full Auto.

I hope you can help me with my Problem.
Cheers