Is this possible in Bf1942, I don't even know where the sounds are stored at.
Yes it is. First find the rfa file called (sound.rfa)Cut and paste it somewhere else. Open it with the RFA Extractor. Extract it to your main Battlefield Dir. Then you will have a sounds folder with three folders inside a 11khz 22khz 44khz. Now rename the sound you want to use to what it is in the folders. And place one copy of it into each folder. Hope that helps.