$ lsof /dev/snd/*
COMMAND     PID USER   FD   TYPE DEVICE SIZE  NODE NAME
xfce-mcs-  3329  rob    5u   CHR  116,0      12123 /dev/snd/controlC0
azureus   20190  rob   87r   CHR 116,33      12068 /dev/snd/timer
azureus   20190  rob   88u   CHR 116,16      12116 /dev/snd/pcmC0D0p
azureus   20190  rob   89u   CHR  116,0      12123 /dev/snd/controlC0
java      20242  rob   87r   CHR 116,33      12068 /dev/snd/timer
java      20242  rob   88u   CHR 116,16      12116 /dev/snd/pcmC0D0p
java      20242  rob   89u   CHR  116,0      12123 /dev/snd/controlC0