Hi, you will probably not be getting any sound.
I have issue with DCR-SR40 what uses "MPEG2 muxed" compression format.
For some reason no one understands, and that APPLE shops don't tell you about unless you know what to ask when buying and the software engineers apparently refuse to fix, Imovie and Final Cut don't read this compression format properly.
You will find workarounds, that are extremely time consuming and cumbersome when searching under mpeg2 muxed in the forums.
Best of Luck.