No audio - what exact demux option in MPEG Streamclip?

The only option that mentions QuickTime is Export to QuickTime. I could not find a DV codec option so chose Apple DVCPRO50-NTSC. No audio. Then tried DVCPRO50-PAL, no audio. I then tried Export to Other Format and chose QuickTime movie. Didn't see any codec options. There are so very many options. Here's file info for the one I've been playing with:

Stream Files: MOV03426.MPG (63.35 MB)
Video Tracks: 224 MPEG-1, 640 × 480, 30 fps, 104.86 Mbps
Audio Tracks: 192 MP2 mono, 32 kHz, 64 kbps

As I said, they play fine in WMV as originally transferred off the camera's card.

Trying to get more info on the media files. Meantime, I think I'm getting somewhere but it's weird. I again tried Demux > Demux to Unscaled M2V and AIFF, which the MPEG Streamclip user's guide seems to be saying is for Final Cut. Imported both files into FCE (also imported .dv file only, which automatically links to the .aiff file), dragged them to the video and audio tracks, rendered, and played, but still no sound. How am I monitoring sound? That may be the key. The demuxed files are mute through external speakers, but when I unplug them and get sound through the internal speakers, the imported, rendered .dv clips have audio. Go figure. Is that really what's happening? The original files still have no sound regardless of speakers.

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?

Thanks for all the help. I still do not understand why the audio plays through my internal but not external speakers and am surprised that footage like this from a primarily still camera was so difficult to get into an editable format.

OK - thanks much.