I used a shareware program that I downloaded called 123 Audio Video Merger, worked great to combine four .mp3 files into one. Added the file to my slide show, plays fine. Burned a DVD-R and a DVD+R, my computer plays them fine using the RoxioDVDMAX Player. Unfortunately, when I play the DVD-R on my JVC XV-S500BK (recent vintage), no sound but the slide show displays and runs as it should. Any clues about what I can do to correct will be greatly appreciated. Thanks!