Only one application can use sound at once

[Ephemeral]

Hello,

My problem is as following : Only one application can use sound at once, for example if I want to watch something in VLC I need to close Firefox/other sound using apps, and then open VLC, same goes for VLC and Firefox the other way round, and every other application.

Any idea?

Cheers,
Mark

[gandaran]

http://ubuntuforums.org/showthread.php?t=885437

[Ephemeral]

Oh perfect.
Cheers mate.