I think this is not a multitasking issue but an audio output thing. You can setup amplitube to run in background (setup -> last option) and switch to iRealbook then. As long as the player is not running you can hear your instrument. But as soon as iRealbook player starts, the audio from Amplitube is gone. That's it. Maybe someone from IK can help to integrate with iRealbook?
cheers
EKKI
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