How can I reduce the audio bitrate on existing .mov mpeg4 files made from .dv files (which I don't have anymore) using ffmpegX?

They won't load on my iPod because of the problem in ffmpegX where I select the audio bitrate as 96 but it actually doubles when the file is made, so the bitrate becomes 192. So I want to reduce the bitrate to 160 or lower so I can use the files on my iPod.

Note, I now encode my .dv files by setting the audio bitrate to 80 and it becomes 160 in the final file and then loads on my iPod just fine.