[Freeswitch-users] Concatenated multiple playback types

Hello there, I am trying to add some silence before the alone sound file in my conference.cnf.xml and can't get it to work. Here is what I tried: <param name="alone-sound" value="silence_stream://5000!file_string://conference/conf-alone.wav"/> <param name="alone-sound" value="silence_stream://5000&file_string://conference/conf-alone.wav"/> <param name="alone-sound" value="silence_stream://5000|file_string://conference/conf-alone.wav"/> <param name="alone-sound" value="silence_stream://5000;file_string://conference/conf-alone.wav"/> Any idea on how to do this? Thanks! Emrah