@sgunhouse it's quite nice. And I've found out that just the key sound is 3 different sounds. As well that space and enter make different sounds.
I've tried digging through all of the opera files, can only find references to the setting it self, and the internal state of the three sounds. But no reference as to where they are located, I'm beginning to think they aren't located anywhere and are just generated by the browser itself, vs loading them from a file. That or they're encoded somewhere.