You need to add your sounds to \Graphics\attack.whdat file. If the weapon is long-range and there is a sound of shooting, then you need to put this sound in the folder \Audio\Attack\ yoursound.wav. And the sound of the weapon hitting the \Audio\Impact folder .To fill in the data in the attack.whdat...

So, how does one go about adding custom weapons, with custom soundfiles? I have the weapon part done, but when shooting, doesn't emit any sounds for the attack, or impact.