thank for your help, but i still have a problem. I put a "new" sound on picture n°1 , using the Customize Slide/ Music tab . I want the sound to continue on slide n°2, so i put "Continue" to the Customize Slide/ Music tab , but it doesn' t work. The sound stop after the first slide and there is no sound on slide n°2 . I know it's possible to use the synchronise system but it would be more easy for me to use the Customize Slide/ Music tab. Matiou