Custom sounds?...

[Ermu]

For music, use
PlayMusic(string& asMusicFile, bool abLoop, float afVolume, float afFadeTime, int alPrio, bool abResume);


Plays music.
asMusicFile - the music to play + extension .ogg
abLoop - determines whether a music track should loop
afVolume - volume of the music
afFadeTime - time in seconds until music reaches full volume
alPrio - priority of the music. Note that only the music with the highest priority can be heard! 0 - highest, 1 - lower, etc

And for normal sounds use

PlaySoundAtEntity(string& asSoundName, string& asSoundFile, string& asEntity, float afFadeTime, bool abSaveSound);

asSoundName - internal name
asSoundFile - the sound to use + extension .snt
asEntity - the entity to create the sound at, can be “Player”
afFadeTime - time in seconds the sound needs to fade
abSaveSound - determines whether a sound should “remember” its state. If true, the sound is never attached to the entity! Also note that saving should on be used on looping sounds!

ALSO

in the .snt of yours, remove the .ogg from the "Sound File"

AND when you use the sound in a script, use .snt instead, example

PlaySoundAtEntity("", "scaresound.snt", "Player", 0, false);