Do not modify the first two lines or last line in the file.
Text between /* and */ is a comment and does not get processed - it's just there for descriptive purposes.
The file uses a convention of grouping audio files together based on the folder they are in, with a comment at the start of each block saying what the folder name is (eg. "/* sitrepmod */" in the example above).
Properties
As you can see from the fist comment in the file, each line defines the following properties:
audio - this keyword must appear at the start of each line that defines audio file settings
filename - the file name of the audio file, enclosed in "quotes"
oneshot / loop - most audio files are "oneshot" which means they play once and then stop.
volumne - a number between 0 and 100 defining the volume of the audio
range - ??? it's not clear what this is for - use 1800 as that is what everything else uses
An example of a looping audio file is bldloop.ogg - the sound made by construction droids when they are building:
audio "bldloop.ogg" loop 20 1800
Avoid using "loop" because it's not possible to stop looping sounds via the Javasrcipt API - they'd just play forever.
See also
audio.wrf - this defines the locations of audio files
Audio (Sound) – audio modding guides and directory of all audio supplied with Warzone
playSound() – JS API function to play an audio file