FCP7 multiclip no audio in viewer

I've just gone back to a project I left a few months ago and I'm sure I've solved this before and just forgtton how to use multiclip or exactly how I set it up.

The problem: I'm unable to hear any audio when I am in the viewer and the multclip window is playing.

Its a concert and the only audio I have at all in the timeline is from Camera 1 ( of 6).

This is probably very basic.

BTW - I only see the Blue outline around my clips, no Green at all