I am not sure if this is a bug or we have to handle it manually (by using Event.APPLICATION_SUSPEND)? :-/
My mp3 audio keep on playing after double-clicking on the home button (iOS).
I've tested the following situations: Lock, Home and Sleep. All seems to be working normally (audio paused).
Be careful, this is exactly the kind of thing that Apple would love to reject an app for - unless it's a radio player, music player etc. where it's intentional.
So the audio in some apps can play at random times like that and nearly gave me a scare, definitely it is a bug. The app was an Objective-C app for a TV station allowing to play re-runs of shows.
Some of the apps/games I remember from the iPhone3 days would stutter with the sound or keep playing when they exited due to memory errors. Just saying, if that helps narrowing down the issues.
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Kingdom Rush -> paused the music
Pocket Minion -> not paused the music
Albert -> paused the music
Flick Champs -> not paused the music
I think Pocket Minion and Flick Champs are two of the popular games.
On the other hand, I've also tested this with a children's book and unfortunately narration continues. I think this _may_ be acceptable for background music but not for narration.
For the last couple of days, I'm moving the iOS port of Gideros' sound system to ObjectAL. I haven't tested this on ObjectAL but most probably it handles this case well and pauses the background music. Therefore this issue will be solved when I finish the moving.
Thanks to @Chang, @moopf and @OZApps for the feedback.
Just downloaded Pocket Minions and the music fades out on my iPhone 4S when I click the home button and resumes again if I go back into the app. Interesting that it's working differently on your iPod touch though.