Changing the default sound driver...

Hi. I recently installed the creative x-fi sound drivers. The installation did appear to have completed succesfully.
Yet, i cannot get the new driver to be the default one.
When i type >aplay -l, I see the xfi card (displayed as card 1), but the on-board card is listed as card 0. I am assuming I need to switch this around to get the x-fi card to be default? If so, does anyone know how?

I still am a n00b when it comes to playing with drivers in linux.
Would appreciate if anyone can help me.

> aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: NVidia [HDA NVidia], device 0: ALC888 Analog [ALC888 Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: NVidia [HDA NVidia], device 1: ALC888 Digital [ALC888 Digital]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: XFi [Creative X-Fi], device 0: X-Fi 20k1 [WaveOut/WaveIn]
  Subdevices: 8/8
  Subdevice #0: subdevice #0
  Subdevice #1: subdevice #1
  Subdevice #2: subdevice #2
  Subdevice #3: subdevice #3
  Subdevice #4: subdevice #4
  Subdevice #5: subdevice #5
  Subdevice #6: subdevice #6
  Subdevice #7: subdevice #7

Thanks.