Does setVolume do anything on a SoundTrack?

I’m trying to add a sound to a SoundTrack and change the volume of that track, but it doesn’t seem to do anything as heard here:

Am I doing something wrong?

adding @docEdub to the thread

The volume on a SoundTrack can’t be set before a sound is added.

Try adding the sound first, then set the sound track’s volume, like in this playground: