sddroog,
It seems that you're not the only one that has problem with playing WAV files on Android:
http://board.homeseer.com/showthread.php?t=157375
I use the .MEDIAPlay() function of Homeseer to play the wav file, that's the only thing I found that successfully plays the wav file here.
If there's a better way, tell me. If there's another way that will lead to success, tell me.
(not just you of course, but anybody for that matter)
If a plugin user needs to be able to choose between different "wav-play-methods", I'll extend the Plugin so that he/she can.
But for now, the only way to play a wav file (known to me) is the method mentioned above.
I do have HSTouch and Android, but not enough time to invest it in something that looks like a dead end as long as I don't have a clue what to do about it.