The 1st generation iPad will do video over AirPlay... It cannot do "mirroring" over AirPlay...
Only the 2nd generation and up can do full "mirror mode" Airplay...
As far as the audio output through Apple devices... The setup that I run at our local downtown theater consists of outputting video and audio over HDMI, as well as optical audio out of our iMac... The setup that I put together runs 1080res HDMI video output with embedded audio into an HDMI to HD-SDI box, and into out matrix system throughout the building... At the same time, the iMac is running optical audio out via the built-in mini-TOSlink connector (which is made into the headphone audio out jack), into our cinema audio system...
The iMac is setup in the Audio/MIDI setting utility to be a multi-output device... This allows me to be able to send the audio out the Mini Display Port through an HDMI adapter, and onto the rest of the building via HD-SDI, as well as simultaneously sending audio to our Denon DN-A7100 pre-amplifier...
If you need to send analog out instead of optical via TOS-link, you can do the same and use a regular 3.5mm TRS cable into a DI or console... You should be able to do the same with a USB audio interface as well (as far as doing a multi-output device in the Audio/MIDI utility)...
If you want any screen shots of what I am talking about as far as the multi-output setup, just let me know!
Cool, thanks Ryan! Yup, mirror mode was a must in our application, but might not be the case for everyone. I did know about the optical on the iMac, but it's a helpful reminder. The same company has a bunch of iMacs for PlayBackPro and their optical dongle could be helpful for grabbing digital off of that.
I'm definitely with you that it's the way to go getting it all in one HD/SDI stream if you're distributing it, but neither I nor the OP needed that option. Still definitely good info.
Hope eveything's going well up in C-Ville, I worked for Mike and Jason for a good while. Which venue are you referring to? If your on one side of the mall tell John I said hi, if it's the other tell Gary hi.
thomas d.