Nice illustrations on the book!
This is unfortunately a bug. iOS 9 and 9.1 had an issue where audio would not work on tapping, so we made a workaround in Hype. iOS restored the functionality in 9.2, but the workaround we had broke it in a different way! This will be fixed in the next version of Hype that we hope to have out soon. Until then, there are these workarounds:
- Use On Mouse Click actions instead of On Mouse Down
- Uncheck 'Use touch events' in the Document Inspector