silence trashcan?

How do I silence the 'camera' sound when items go to the trash bin, while keeping the 'preserve trash' functionality? I thought I had this solved when I found the "TrashCanMorph >> playDeleteSound" message, but this is a 'ping' sound that plays simultaneously along with the 'camera' sound. I successfullly eliminated the 'ping' by commenting it out in "TrashCanMorph >> moveToTrash" but I haven't been able to figure out who's responsible for generating the 'camera' sound. 

Thanks,

--Mark