To Play a MP3 we would want to select the 'WAV' or 'Mixer' device since your favorite media player uses this device to play MP3's.
In this case the 'mixer' slider is selected
Here is where you can get confused... Some sound cards (like the one represented by this mixer panel) will not allow you to directly access the WAV device as the recording input, but WILL allow you to select the 'mixer' input. If your sound card is like this one, then you would want to select 'Mixer' as the 'recording device' (see above).
Adjust the volume of your MP3 using the 'Mixer' slider or the 'WAV' slider if it is available and selected.
If your 'recording control' panel looks like the one above, and you were able to play an MP3 while listening to people in the chat room, you should now be able to play an MP3 into the room.
Just start your MP3 playing and 'key up' in the room by pressing the CTRL key on your keyboard, or select 'lock microphone' from the '
