File Types" (Use bed for playback)

[RadioNarodnjkSi]

Please help me. I have a problem and do not know what this feature and how to configure the worse clips that you do not play ???
"File Types" (Use bed for playback) "Bed level ???  >< +30db or -30db
It is not clear to me what the function itself means and how to set up ... I ask for help and advice.
thank you..

 

[djsoft]

Bed is like a "background" music while track of that file type is played. "Bed level" simply sets the volume of that background music.