no bip on toggle key, even after customization

Hi, I'm on a French Gutsy

I want to have a bip when I depress the "capital letter key". I did the following:
system > preference > control center > personal > wheel chair icon
on the new window : preference > keyboard access
on the new window : filter tab
I ticked the 2 following boxes
- activate keyboard access functions
- toggle key : activate toggle keys

When I did so, the capital letter key was inactive : no LED activated

I did all that again BUT BEFORE, I activated the block letters key, w/ LED turned on

Then no problem I could activate/deactivate the key, the LED followed.

Strange isn't it? sorry for the approximate feature translation, but, as I said, I use a French Gutsy version.

Bye