Using audio in and out at the same time

I am looking to get my church to get a new computer to be used in services.

I was hoping to pursuade them to get an iMac.

One question I thought of:

If I am using the mac to output sound to the mixing desk - eg itunes/dvd etc - can i then use the audio input to record an output from the mixing desk at the same time.....?

I only ask cos tried to do it on the old pc we used and it didnt like it at all!

Consultant said:

Yes. It'll work as long as you don't have the inputs playing on computer speakers, as that will cause feedback.

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Click to expand...

Thanks. That makes sense.

Any suggestion as to what to record with. Garageband? Or just Quicktime?