iChat Video Problem

When I record video conferences from ichat, the latest version on leopard, there is no sound recorded. anyone know why?

What are you using to record the conference?

I am using the recorder in iChat to do it.

Specifically, when I am video chatting in ichat, i go to the video option and then record chat. My sister has a Macbook and it works just fine, running Leopard and the latest version of iChat. I have a Macbook pro and it does not record sound, only video. All of my audio options are set correctly and still, it does not work.