Steps to reproduce:
1. Export project as HTML5 website.
2. Open link on iOS device mobile Safari, tap to unmute. touch and 2-finger touch to test audio events.
3. Add to Homescreen
4. Back out of browser, open from homescreen.
All audio plays intermittently. Sometimes no audio, sometimes just beep sound effect, sometimes 1 of the expected music tracks, sometimes the other. Edit: Also, occasionally the game cannot be backed-out of, necessitating a hard-reset of the device!
Open link from homescreen. Tap to unmute mobile safari, music plays at start. Beep plays on every touch. On 2nd touch, music is dimmed, and new audio plays. Release 2nd touch, return to old music.
Mobile Safari: iOS 6.1.3
Internet Explorer: N/A
Operating system & service pack: Windows 7 32-bit. Service pack...not listed in Ctrl Panel > Systems Settings??
Construct 2 version: R134