Does GarageBand iOS 1.2 support AirPlay? I see reports from Google searches that AirPlay was added to an earlier version but had lag-related performance issues. With 1.2, I see no way to select audio output. If I already have a Jambox connected, GarageBand will use it, but so far I can't get it to use AirPlay.
It's a Treasure Hunt!
On the iPad:
Click the wrench icon to open the Settings dialog. One of the settings is AirPlay - Bluetooth. Set that to On, and the usual audio output selector will appear in the toolbar.
On the iPhone:
Click the gear icon to open an untitled two-sheet settings dialog. Select the Song sheet. The AirPlay - Bluetooth selector is there.