@BobC OK no problem. A new idea. As I only need to Tx to the player I'll just do a bit of bit banging to a pin. That should work just fine.
The idea behind the project is to add a door bell to my system which has selectable MP3 files to play when the 'button' is pressed. Really quite a fun thing to have a personalised message to welcome visitors to special events rather than just a DingDong.
