When you ask a question, then press the home button and then come back to the game and answer the question, if a sound (like music) was playing before you press the home button, then the sound is not played any longer.
1) Play sound loop (like music) with OpenGL (not with Audio Player),
2) Ask a quesion,
3) Press Home button,
4) Return to the game,
5) Answer the qestion,
6) Music is not playing anymore.
It works ok when no question is asked. I mean, you press the home button and then come back and the music is there. And also, when you ask and respond a question without pressing the home button. If you do the same with Audio Player, the music is resumed before you answer the question when you return to the game.
To sum up:
1) If you press the home button when sounds are playing, when you come back to the app the sounds are resumed with no problem, both in OpenAL and Audio Player.
2) If you ask a question and then press the home button, when you come back to the app the sounds played with the Audio Player are resumed before the user replies. And after answering, OpenAL doesn't resume sounds that were paused nor replay them (unless you restart the frame); OpenAL only plays sounds that weren't paused before deactivating the app.