How can I specify which device to play the sound?

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Hi,
 
I am using ALSA in an embedded system that based on Blackfin, there are 2 sound devices in the system,
 
root:/> ls /dev/snd/
controlC0  controlC1  pcmC0D0p   pcmC1D0p   timer
 
I compiled a sample minimal program called alsa1, http://equalarea.com/paul/alsa-audio.html, then I run './alsa1 default', I can hear the sound from one device, how can I play the sound from another device? Thanks.
 

Regards,
ZhangZQ
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