to get on the digest, send the text "set theatre-sound digest" to listserv@listsev.aol.com

to get OFF the digest, send the text "set theatre-sound nodigest" to listserv@listserv.aol.com

both commands without the quotes

you must first be subscribed to the list to get the digest; 
see the instructions on the main list page if you're not 
already subscribed.