ALSA lib confmisc.c:1107:(snd_func_refer) Unable to find definition 'defaults.pcm.surround51.card'
ALSA lib conf.c:3493:(_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:3493:(_snd_config_evaluate) function snd_func_getenv returned error: No such file or directory
ALSA lib conf.c:3951:(snd_config_expand) Args evaluate error: No such file or directory
ALSA lib pcm.c:2102:(snd_pcm_open_noupdate) Unknown PCM surround51
aplay: main:544: audio open error: No such file or directory