How do I play sounds from my iPad to my Stereo wirelessly?
You can connect the iPad directly to your stereo using bluetooth. Or you can use AirPlay to stream audo to your iMac. However you cannot record anything while doing this:


  While the "AirPlay - Bluetooth - HDMI" switch is on, an alert appears if you try to record an Audio Recorder or Guitar Amp Touch Instrument, or if you try to record a sound with the Sampler. You can turn the switch off from the alert.


From: http://support.apple.com/kb/HT4622