NO. Your new interface, *WILL BECOME YOUR SOUNDCARD*. Most all interfaces, no matter if USB, Firewire, PCI will act as both how you get sound into the computer, and how you get sound out of the computer. Usually, you can only have one soundcard active at one time. So, usually, when you hook up your new interface, you will need to disable the internal soundcard, or what ever other soundcard you used to use.