Hello. I've had my XP-50 for ten years and this problem just started but you say that everything is still working? well nothing as far as sound generation is completely gone. One day the display went out but there was still sound. I restated the next day it was fine. Then I noticed the screen fading in and out.I checked to see if it's the battery. It was okay but I changed it any way.Thats when I lost all sound. I'd like some help on this myself. I have a lot ofmusic to record in the coming weeks and this throughs a damper on this. I hope someone from Roland read this site.