wayne@hal9000:~$ lsof /dev/snd/*
COMMAND    PID  USER   FD   TYPE DEVICE SIZE NODE NAME
firefox-b 5117 wayne  mem    CHR  116,8      7845 /dev/snd/pcmC0D0p
firefox-b 5117 wayne   80u   CHR  116,8      7845 /dev/snd/pcmC0D0p
firefox-b 5117 wayne   81r   CHR  116,2      7764 /dev/snd/timer
firefox-b 6877 wayne  mem    CHR  116,8      7845 /dev/snd/pcmC0D0p
firefox-b 6877 wayne   80u   CHR  116,8      7845 /dev/snd/pcmC0D0p