I know you can connect a USB MIDI keyboard to the iPad with the camera connection kit. However, I'd like to know if the following situation will work: 1. You have an app that has for example a virtual instrument of a piano and you can play it with your MIDI keyboard. 2. You switch to e.g. Safari so you can read a PDF of sheet music. Is it possible to still hear sound from app one and keep playing in this situation or does it just cut out as you switch apps?