No audio - what exact demux option in MPEG Streamclip?

I have a bunch of MPEG1 Muxed video files from my brother-in-law's still camera. Imported into FCE, video is fine, no audio. Read many message boards and determined that the files are muxed (audio and video together) so then downloaded MPEG Streamclip. I've tried varioius Demux, Export, and Convert options, but still no audio in either FCE or even QuickTime Player. As an experiment, I sent a file to my Dell. Both video and audio played in Windows Media Player. So the audio is there, but why can't I get it on my Mac and import it into FCE? What exact Demux, Export, or Convert option should I be using in MPEG Streamclip? Or is there an FCE setting I'm missing? I also tried bbDemux with no luck. If you have an idea, please be specific!

Thank you, Meg The Dog. That worked just fine. You didn't specify which Export/Convert/Demux menu item to use so I used simply Export to QuickTime. The other method (Demux to Unscaled M2V and AIFF) produced audible files but your method was more straightforward for importing into FCE and may be better quality.
For the record, here is what the MPEG Streamclip user's guide says:
Demux to Unscaled M2V and AIFF...
demuxes the stream and creates an "unscaled" M2V video file and an AIFF audio file; you can import these two files in Final Cut Pro 4 or HD (and also in Final Cut Express if you have the MPEG-2 component); usual rendering time is required. Please DO NOT use drag & drop to import the files (Final Cut may crash due to an internal bug), but open the M2V file using the File menu and the AIFF file will be automatically linked (if you used the same name for the two files).
The "unscaled" M2V file is a demuxed file which tells QuickTime and Final Cut to not prescale it, e.g. to 720 x 540; it preserves its original size e.g. 720 x 576 or 720 x 480 so you won't lose quality when you render it. This is a special feature of MPEG Streamclip.
That, however, produces two files. Only need to import the .dv file, which is why I say your Export to QuickTime method is more straightforward.
Thanks for all the help. I still do not understand why the audio plays through my internal but not external speakers (any ideas?), but I will mark my question answered. I also wonder why muxed video files from a primarily still camera creates such a problem. Isn't this commonplace? How do people edit footage like this without jumping through all these hoops?

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