I guess my thought was that although the weapons are technically the same, since they are built and developed by different scientists, they should have their own sound. An M-16 and an AK-47 are both ballistic bullet weapons, they both have drastically different sounds. From a distance they might sound very similar, but in a firefight you'd be able to tell the difference, and that might be important, if say you heard one behind you, hehe. And that's exactly the thought I had for this game. If you hear a PPC that doesn't sounds like yours over your left shoulder, you might want to turn around and see what it's coming from. I assume the sounds engine will allow for subtle variations in pitch so that every PPC blast does't sound exatly the same - even a 1% pitch difference will prevent sounds from phasing. But Clan weapons should have a different, more refined character than IS weapons do. What chaoswolf mentioned about Clam lasers is right on the money - less crack, more hum.