To get your WAV, MP3 or MIDI attachments played by your BB you’ll need MasterDoc by Dynoplex. It supports full circle of operations with media files: playing them, saving to BB internal memory or SD, sending as attachments.
Please note: to get this functionality your device OS should be 4.2 (to check it go to: Options-> About).
The application is available at: http://dynoplex.com/masterdoc.shtml
If your device is on a BES then you DON’T need the software mentioned above but you do need.
1) your BES admin to setup the distiller correctly on the BES (Logon, go to control panel, Blackberry Server Configuration, and set attachment options)
2) an IT policy that permits the playback of audio files