[mclasen@localhost Desktop]$ gedit
Gtk-Message: Failed to load module "libcanberra-gtk-module":
libcanberra-gtk-module.so: cannot open shared object file: No such file or directory

If you look at the module loading code in glib, you have to either 
strip the lib or add the .so. The customary solution is to strip the lib.

With that correction, the module gets loaded, but...

[mclasen@localhost Desktop]$ GTK_MODULES=canberra-gtk-module:gail:atk-bridge gedit

** (gedit:8405): WARNING **: Failed to play event sound: System error


I've looked, and pulseaudio is running, and sound does work in general.