janne@rig:/tmp$ for c in {0..11}; do echo hw:NVidia,$c ; aplay -D hw:NVidia,$c test.wav; done
hw:NVidia,0
aplay: main:682: audio open error: No such file or directory
hw:NVidia,1
aplay: main:682: audio open error: No such file or directory
hw:NVidia,2
aplay: main:682: audio open error: No such file or directory
hw:NVidia,3
Playing WAVE 'test.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Mono
aplay: set_params:1087: Channels count non available
hw:NVidia,4
aplay: main:682: audio open error: No such file or directory
hw:NVidia,5
aplay: main:682: audio open error: No such file or directory
hw:NVidia,6
aplay: main:682: audio open error: No such file or directory
hw:NVidia,7
Playing WAVE 'test.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Mono
aplay: set_params:1087: Channels count non available
hw:NVidia,8
Playing WAVE 'test.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Mono
aplay: set_params:1087: Channels count non available
hw:NVidia,9
Playing WAVE 'test.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Mono
aplay: set_params:1087: Channels count non available
hw:NVidia,10
aplay: main:682: audio open error: No such file or directory
hw:NVidia,11
aplay: main:682: audio open error: No such file or directory