As we know, to play a html5 sound in iOS there must be physical user interaction to start. Click a play button and the sound can start. But once done you don't have to do that again. If, after the first sound finishes you have programmed another to start automatically, that works. And it use to work in KRPano until iOS 8. I just tested with iOS 7.1 where different sounds can play in sequence. In iOS 8.1 and 8.2 you need to touch the screen to start each sound.
A javascript example doing the same thing which works in iOS 8.x the same as in iOS 7.x.