Yes, I put WAV,M4A,OGG all into the project. I spent several days on this issue and finally found some different responses on different mobile phones:
1. ASUS Padfone Infinity: it's buggy with Cocoonjs Launcher, I can't play 10-sec music on it. Besides, when I play the compiled APK on this phone, there are a lot of glitches in the background music.
2. HTC Desire HD: everything is good for Cocoonjs Launcher on this phone.
I guess ASUS put some audio tweaking driver in Android system. It supports ASUS' audio filters like theater, rock&roll, classic, speech... When I turn to speech mode and run the APK, glitches get heavier and it's about 3~4 glitches every minute.