That depends on where your camera is located, your camera have to be close to the start location to hear the sound.
You might not want to use a 3D sound.
Or maybe the sound is not 3D but you try to play it as a 3D sound which would fail.
The Grom variable may be incorrect as well but I can't tell for certain with limited info.
edit: at second glance it's not a variable. Remove the condition and it'll work.