Okay, I need a Flash mp3 player that utilizes a md5 hash in the input variables -- which puts it through to a php file, which will detect whether the file exists and then output it through to the flash player.
The main intention is to prevent users from downloading the audio without paying. i.e. to know the exact location of the source mp3 file and then directly download it and bypassing our flash player.
Strictly speaking -- the only way I know to do this is to use PHP and stream the content through to the flash player.
So, to sum up -- I need a simple mp3 flash player which is going to play one mp3 file (no playlist or fancy xml required) at a time. The variables to play can be like [url removed, login to view] -- and then the [url removed, login to view] will open the file which is hidden in an directory with a obscure filename (which we retrieve from the database) and then stream the file to the flash player.