Unit's Attack Sounds

Ive been trying to change a unit's attack to a differnt animation and also changing the attack sound. I am currently using the Blink World Editor Mod. In it ive been able to change the attack animation and ive tried changing the sounds but they fail to work. Ive also tried taking an existing unit with a sound already set for its attack and adding a differnt animation but this still seems notto work.

Is there somthign im missing that i must do to get these things to work? Thks for the help.