[Freeswitch-users] Best way to play a message to the first member of a conference?

Hi, I would like to play a custom message when someone joins a conference. I know I can play a message to each joiner individually, but would rather play the message into the conference as a whole. I have noticed that when the first member joins the conference, there is a delay of up to a few seconds after they join before they can hear the announcement, so the initial part of the announcement is missed.  It doesn't seem to happen for subsequent joiners. I have tried adding a delay before playing the message, but it doesn't reliably work. Any ideas why this initial audio missing occurs, and if there is a workaround? Thanks, David