Sorry too bother you again, but
(1) the Player-Tag [audio_player_single] is already part of the Template and nevertheless ist doesn’t work – even making a new Template with just the Player-Tag inside won’t do the trick » see Screenshot 1.
(2) The Player on the Download-Page seems to work fine in Safari, Opera and Firefox – but doesn’t work in Chrome » see Screenshot 2. I know Chrome is not the most popular Browser, but the Audio-Playback should work in the usual supspects: IE, FF, Opera, Chrome, Safari.