One of the big complaints I hear about Ubuntu users is the fact that a single application can lock the sound card, not allowing other applications to play audio simultaneously. Well that is no longer an issue, as we will discuss here.
Select Default Sound Card
First you will need to run the following command to install asoundconf
sudo apt-get install asoundconf-gtk
After this change your default sound card under System → Preferences → Default Sound Card to PulseAudio. After this you should be able to listen to multiple audio sources at once.
