By default the Windows Media Player plays only one audio source at a time. For example, if you are listening to Control-1 and you click on Control-5, Windows Media Player will stop playing Control-1 and switch to playing Control-5. If you prefer that Windows Media Player open a new (second) session enabling you to listen to Control-1 and Control-5 simultaneously, make the following setting changes:

1. Start the Windows Media Player.
2. From the View Menu select Options...
3. Select the Player Tab (see screen below).
4. Select Open a new media player for each media file played.
5. Click the OK button.