[Freeswitch-users] Tell Conference to stop music by ESL/progammatically?

Can I tell the Cnference application to stop the music even if there is only one user programmatically or by ESL? Scenario: I want the default behaviour: when there is one participant, Conference will play music. However one of my "participants" is actually another Conference application (not FreeSWITCH) that can signal to me the number of callers it is currently muxing. In this case if it signals two or more I want to stop the music. From FreeSWITCH POV there is only one channel. Is there a way to use ESL to stop/start the music? (At the moment Confluence seems to be down, and google is drawing a blank here.) -- Richard Chan