However, ripping DVDs as AVI (portable generic) files results in no sound, but the picture is fine.
I have tried the different formats (audiocopy, mp3, etc.), and I have also made sure the volume is set to 150% with a 192bit rate.
What player is your use to play the avi file ? you cannot hear any voice from this file ?
Please make sure something, the audio stream is in your created file. you can use tool like Gspot or AVIMaster or virtulDub to check it. just open the file use the tool, if you can see the audio stream information, I think maybe it is your have not correct audio decode filter, so the player cannot decode the audio stream.
you can get file information from virtualDub open file, select menu file\file Information, and you can get a window like that.