Hello

,it's a known bug that you can't hear the sound of videos that you put in billboards yet,but the devs said it will be fixed in an update later.
Now to the Speakers: Music Speaker:Can play music in a loop:Either ingame music or user music of the folder documents/frontierdevelopements/user music
Triggered Speaker: Can be triggered by a coaster,ride,tracked ride,or display sequencer,can play user sounds and ingame sounds from documents/frontierdevelopements/user music
Display Speaker:Has to be selected in the music category of the display sequencer.Plays the music you have put in the sequencer.Also in the folder: documents/frontierdevelopements/user music
Hope that helped[big grin]