~ $ sudo lsof | grep /dev/snd
kmix       5576         tdn   10u      CHR     116,10                 14451 /dev/snd/controlC0
firefox-b  5679         tdn  mem       CHR      116,8                 14421 /dev/snd/pcmC0D0p
firefox-b  5679         tdn   56r      CHR      116,2                 14029 /dev/snd/timer
firefox-b  5679         tdn   58u      CHR      116,8                 14421 /dev/snd/pcmC0D0p