Well i cant seem to get it to work, probably my idiot noobness stopping me from seeing the obvious.
Can you guys find anything wrong with this?
<!ENTITY snasteroid "0xD6428301">
beamType= "laser"
primaryColor= "0xff, 0xff, 0xff"
secondaryColor= "0xff, 0xff, 0xff"
sound= "&snasteroid;"
<Sound UNID="&snasteroid;" filename="pewpew.wav"/>
Edit: nm figured it out.