controls certain aspects of the sound daemon.
esdctl [options]
lock - only the "owner" of the daemon can play sounds. the first key (obtained from /.esd-auth) submitted to the daemon identifies the owner.
unlock - anyone can play sounds through the daemon.
standby - frees the audio device for use by other programs. all sounds are ignored until the daemon is resumed.
resume - brings daemon out of standby mode
NOTE: more than one option may be listed on the command line