s2 souncard options...whats best???

Hey peeps.. Got a question about the s2 and what soundcard configuration to use. When i have Audio device set to traktor kontrol s2(ASIO) and the in built soundcard set to traktor kontrol s2(asio) the audio graphic on the main screen is orange! But when i have the audio device on kontrol s2(asio) and the in built soundcard set to kontrol s2 wdm wasapi (shared mode) it is blue. I thought the asio options where the best ones to use!! Im confused... Any help would be greatly appreciated..

Thanks

Nathan R

Setup:

Compaq, i3 4gb ram, windows 7

Traktor kontrol s2