Its aim is to allow you to have many different audio programs running at once, to save their setup, close them down and then easily reload the setup at some other time. LASH doesn't deal with any kind of audio data itself; it just runs programs, deals with saving/loading (arbitrary) data and connects different kinds of virtual audio ports together (currently JACK and ALSA sequencer ports). It can also be used to move entire sessions between computers, or post sessions on the Internet for download.