esdcompat is a compatibility script that takes the
    same arguments as the ESD sound daemon , but uses them to start a the PulseAudio sound server with the appropriate parameters. It is
    required to make PulseAudio a drop-in replacement for esd, i.e. it
    can be used to make 
    start up PulseAudio instead of esd.
    It is recommended to make esd a symbolic link to this script.