The Personal Audio system developed in 1996 also allowed users to communicate in a variety of novel ways using audio messages. Users could record spoken messages that commented on, annotated, or responded to other audio messages and recordings. Audio comments and annotations to a given audio program were made available to other subscribers listening to that program. User-recorded audio messages could be organized by subject matter, or in message-response chains forming topical audio bulletin boards. Audio programs could imbed prompts which requested the listener to record a response or comment, creating an audio questionnaire for collecting information from users. Audio programming could be created using an HTML like markup language that was translated using speech synthesis into audio programming with accompanying image displays, hyperlinks to other audio programs, and techniques now often used to create interactive voice response (IVR) systems. These audio messaging capabilities are described and claimed in Personal Audio’s U.S. Patent 5,732,216 entitled “Audio Message Exchange System”.