bobby@bobby-ubuntu:~$ aplay -Dsurround51 foo.wav
ALSA lib confmisc.c:1105:(snd_func_refer) Unable to find definition 'defaults.pcm.surround51.card'
ALSA lib conf.c:3479:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory
ALSA lib confmisc.c:242:(snd_func_getenv) error evaluating default
ALSA lib conf.c:3479:(_snd_config_evaluate) function snd_func_getenv returned error: No such file or directory
ALSA lib conf.c:3936:(snd_config_expand) Args evaluate error: No such file or directory
ALSA lib pcm.c:2146:(snd_pcm_open_noupdate) Unknown PCM surround51
aplay: main:547: audio open error: No such file or directory
bobby@bobby-ubuntu:~$