I have no idea if it's possible to be honest. The files are there and already made. I just don't know exactly how to replace the warp animation but you can bet I'd love to figure out how to do that. But for now I'm just going to take care of these sounds.
Okay this is strange. I have one sound effect which is just the beam cannon and then I have another one which is the beam cannon firing + powering down. The thing is though, whenever it finishes, it plays a clip from the beginning of the sound effect for some reason. I don't know why. I'll upload the two files and let you guys see what I mean...
If you download these sounds,
do not listen to them with your volume up. They are very loud and sound great ingame.
Beam CannonsTemporary file upload site. The one labeled 'ffff' is the one with the powerdown and the other one is just a none-stop beam sound effect. Backup your original sounds before replacing them. Play as Advent and purchase a radiant or radiance w/e it's called.
Just looking around on youtube and found this:
http://www.youtube.com/watch?v=UrchciHCI8A&feature=related
I remember playing that mission :< I got so scared

I was wearing headphones too.