I got a rejection from Apple because the app appears to use persistent audio:
code
2.16 Details
Your app declares support for audio in the UIBackgroundModes key in your Info.plist but does not include features that require persistent audio./code
I can't find anything in the plist
Hello,
Please check the parameter "UIBackgroundModes" on the iOS keys on the App Settings page: 
Hi,
non of the options are selected in de app settings.
I seems a cordova plugin caused this behaviour
What plugin do you mean? Could you clarify, do you use an audion component somewhere in the application?