pofis@pofis-laptop:~$ aplay /usr/share/sounds/KDE*up.wav
ALSA lib pcm_dmix.c:819:(snd_pcm_dmix_open) unable to open slave
aplay: main:544: audio open error: Device or resource busy
pofis@pofis-laptop:~$ lsof /dev/dsp* /dev/snd/*
COMMAND  PID  USER   FD   TYPE DEVICE SIZE NODE NAME
artsd   5188 pofis  mem    CHR 116,16      8851 /dev/snd/pcmC0D0p
artsd   5188 pofis   16u   CHR 116,16      8851 /dev/snd/pcmC0D0p
artsd   5188 pofis   17r   CHR 116,33      8674 /dev/snd/timer
kmix    5228 pofis   10u   CHR  116,0      8872 /dev/snd/controlC0
kmix    5228 pofis   11u   CHR 116,32      8937 /dev/snd/controlC1
artsd   7690 pofis  mem    CHR 116,16      8851 /dev/snd/pcmC0D0p
artsd   7690 pofis   16u   CHR 116,16      8851 /dev/snd/pcmC0D0p
pofis@pofis-laptop:~$