Yeah, I meant War3 Model Editor.
In the editor, go to Windows > Sequence Manager. Double click on the name of the animation you want to add a sound to (attached picture 1)
The "Interval" box shows the time that animation begins and ends at. In this example, the Obsidian Statue's Death animation begins at 51200.
Go to Windows > Node Manager and right-click, select "Create Event Object" (or just double-click an existing one for reference) (attached picture 2 shows "SNDoDOBS")
Event Tracks: list of the animation times that this event activates at. Note it's 51200 for the Obsidian Statue death sound
Type: Type of event. Obviously we're talking about sounds in this case.
Data: The 4-letter code for the sound effect. You can either select a default sound entry from the pull-down menu or type in a custom one in the box below it.
Identifier: Probably nothing important, just to differentiate events that would otherwise have the same name.
Global Sequence ID: Not sure how to use this with sounds. You probably don't need to worry about this.