Comment 20 for bug 732572

I took a brief look at this. Basically, normal system sounds are played via libcanberra, which is installed by default on most Linux distro's. However, custom event sounds with .wav files are played via esound, and require you to install libesd in order to work. esound has been deprecated for a long time though, and it's not installed by default on most distro's.

I'll try and think of a different way to do this which doesn't require esound :/