outlook 2003 mail notification sound

I have a pretty big filter that moves all the junk to my junk folder or
deletes it. But outlook always plays the default mail notification sound
even on junk mail. At one point I turned it off because everytime it made a
sound it was probably just junk email. I tried associating sounds with the
filters but it doesn't have a filter sound for mail that stays in the inbox.
Is there a way to get it to play the notification only if the mail doesn't
match any filters?