On my LCD when I record footage, I can only set audio level by "guessing" that -12db is just over halfway.
Is there a display setting that shows me the db markers - ie. -6, -12, -18, etc.otherwise it's a bit dodgy - don't you think ?

I haven't found a way to do this or any reference to it in the manual.

Press the "status check" button. It's the control button closest to the battery compartment along the the bottom of the camera. The info will cover most of your LCD so it's really only good for setting peak levels rather than constant monitoring.

Wow, good catch.

You're a legend Rian - thanks