laugh I use three! Firewire ASIO - Presonus, a Behringer USB ASIO driver, and the PC's inbuilt card for WDM/Games audio and general PC music playback. If setup correctly they all play along nicely. Note though, that each uses a separate protocol smile

If you are not using VSTi's ( apostrophe used because VSTis looks funny wink ) then WDM is fine (in fact if you want ASIO like audio you can use the Microsoft WASapi drivers instead - assuming you are running W7 and above)

As the other guys have written, I would look to settings and installations and also advise what type of tracks you want to have BIAB play for you.