The esound package contains esd, esdcat, esdctl, esdloop, esdmon, esdrec, esdsample and esd libraries. esd is the Enlightened Sound Daemon. esdcat plays a raw audio stream through the daemon. esdctl controls certain aspects of the sound daemon. esdloop is test scaffolding for sample cache, loop, and free. esdmon outputs the mixed stream from the daemon. esdrec outputs from the sound device's current input. esdsample is test scaffolding for sample cache, play back, and free. esd libraries contain the functions used by esd.