xero@xero-desktop:~$ lsof /dev/dsp* /dev/audio* /dev/mixer* /dev/snd/*
COMMAND  PID USER   FD   TYPE DEVICE SIZE  NODE NAME
esd     5272 xero  mem    CHR  116,6      14031 /dev/snd/pcmC0D0p
esd     5272 xero   30u   CHR  116,8      14064 /dev/snd/controlC0
esd     5272 xero   31u   CHR  116,6      14031 /dev/snd/pcmC0D0p