How to force usage of pcm1 instead of pcm0 (HDA audio hardware two time present)

[O. Hartmann]

Hello,
since I have a AMD/ATI HDMI-capable graphics hardware my onboard sound 
hardware (HDA) gets recogniced as pcm1-3, the HDA capable digital device 
onboard the graphics adaptor is numberd pcm0. How can I force the OS 
(FreeBSD 7.1-STABLE) to number the on-graphics-HDA device as the last 
one found?

Thanks,
Oliver