[Freeswitch-users] conference with background sound

[t]

i like to setup conferences with some ambient music in the background.

is there a background sound parameter?

when i use the perpetual sound with local_stream its fine. but all the
users have unmute themselve first.

how can i to things with a user after he entered a conference?
in the dialplan?
via script?

a more general question is how to play no-sound for certain events.
if there is something like:
 <param name="kicked-sound" value="conference/conf-kicked.wav"/>
can i set it to something like:
<param name="kicked-sound" value="nosound"/>
??

t.