How to make "click" sound with any key press?

Hey all!

I’m quite the lurker here in KirupaVille, but I have a question!

I want to have it so that whenever ANY KEY is pressed, a small click sound is played.

I’ve been messing around with the

on (keyPress "<key>") {
    blah (blah blah);
}

but I can’t seem to find a wildcard for the <key>.

I’ve scoured the forums here and elsewhere. Can’t seem to find this little tidbit. It must be a simple solution, right?

Thanks, guys.
-toxoplasmotic