Hi Raiper341, I have similar problem as well:
NO SOUND: iOs 6 iPhone 4s
NO SOUND: Android 4.2.1 on Galaxy Nexus
YES SOUND: Chrome on Vista
YES SOUND: Firefox on Vista
All run through my server at: bringbabies.com/app/soundtest
To isolate problem, I used C2's own example of the side-scroll game template and only add a single music file.
To isolate audio file conversation problem, i created a m4a and a ogg myself then imported into the project.
If you want take a look and let me know if we have similar problems...