CS6 multicam question

Hi

I am on PPRO CS6.03 on windows 7 and have a question regarding multicam.

I just finished watching the multicam section on the training at lynda.com, but it leaves me with one question though.

I saw how to select the primary angle, and that PPRO would use the audio from that angle to cover the whole edit.

That is ok, but what now if I f.ex. do a concert edit, where I have a separate recording from the soundboard to my audio recorder device, and I want to use this audio for the whole edit?

How do I chose this instead?

Thanks

Ulf