I am not fimiliar with Magic DVD Ripper however did you check the sound settings to make sure the are compatiable with the target device ( in this case N800/10 ).

Never had a N800/10 device but they should ( after googling specs ) be able to do ACC and MP3 with no issues at all. Try maybe a lower bitrate ont he audio to like 128 or maybe even 96 to see if you can get audio at all.