A possible problem is trying to play back the audio file from an https url . Mobile browsers (mobile safari in particular) can be quite fussy about the certificates they accept. demo.poodll.com is not using https. This would be the first thing that I would check.
If you are not running https, then try to actually download that file and confirm that it is in fact an MP3 file. Then upload it to demo.poodll.com and try playing it back from there. If it works there but not on your site, it seems likely to be a server/poodll configuration issue. If it does not play back on demo.poodll.com then it is some sort if issue with the file or how it is created.