Changed attribute definition after reading http://stackoverflow.com/questions/387959/nsstring-property-copy-or-retain/388002#388002
Changed attribute definition after reading http://stackoverflow.com/questions/387959/nsstring-property-copy-or-retain/388002#388002

Seems copy is the appropriate choice according to the logic in this
stack overflow answer:
http://stackoverflow.com/questions/387959/nsstring-property-copy-or-retain/388002#388002

openboy2012/AudioStreamer