get a better program?... what are you using now?
I use either DVDXCopy Platinum Version 188.8.131.52 OR DVDShrink Version 3.2
Both work great and can be found on a torrent site or download the demo and find a crack file online.
I have no sound issues with my backed-up/copied DVD's
hope that helps... ive built up a nice collection by backing up my movies..