Shortcut to silence clip

In earlier versions of FCP, I used to be able to quickly silence a clip with Cmd + S. However, it looks like that no longer works with 10.6.2. Is there another short available now to do the same thing?

When I go to Modify -> Adjust Volume -> Silence, I see there's no keyboard shortcut for that option. Is there another way of doing it?

(I'd rather fully silence the existing clip, not detach and delete the audio since I don't think there's an easy way to quickly reattach and raise the volume back up as needed.)