Are you sure the audio isn't being captured? it's possible that you've got a conflict between the soundcard and your 1394 card. Settings are there for preview, right?

What do you mean "settings are there for preview"?

Thanks for the help,

Edit: And I checked the finale captured video, and there was no audio

If there is a conflict, what can I do?

And you're using Firewire? What device are you using to capture with?

I'm using an ADVC 1394 card.

You may have already checked this, but when you open your 'capture' window, go to the 'options' tab and open it, then scroll down to 'preferences' and check the 'capture' tab and make sure you have the box checked that says 'capture audio'. I don't think this is your problem, but it never hurts to check. Another possibility is to uninstall your 1394 card (not physically, but through windows uninstall) and reinstall. Also you can make sure you haven't accidently set your audio track to mute (which I doubt). Just troubleshooting here.

The "Capture audio" checkbox is checked. The audio track also isn't muted. I'll try the card reinstall thing though.

Interestingly, Vegas will record the audio for about one second, then it stops. You can hear this on playback as well.

Well, I just reinstalled both the card and Vegas and I still have the same problem =(

1. Remove all drivers for the ADVC. Remove all Canopus drivers from the system.
2. "remove" the ADVC in Control Panel.
3. Reboot the machine.
4. Don't install any drivers.

See if this works.
If not, I'd be going to Sound Devices in your Control Panel, set that to "No Sounds" and see if that helps.
Last, if none of the above work, I'd be removing the ADVC and moving it to a different slot.

I'll try that. I forgot to mention though that when I go to "preview" in the ADVC 1394 controller, I can hear the sound there. Pinnacle Studios also was able to capture the sound. I've never had this problem prior to today, and it seemed to coincide with a message that my C Drivewas full (though they may be completley unrelated). So I tried recording videos to D instead (which has 120gigs free), but same problem. I also tried cleaning up C (2 gigs free now) and I still had the same problem.

Thanks for the help.

By the way, how do I remove all the drivers? ;)

Is there anyway to record audio through the "line in" instead? Maybe that would work?

It's better to get your 1394 working. You'll have sync issues on any projects longer than about 25 minutes. 1394 "locks" the sound and video together. I've never removed drivers, but I see them from the 'control panel' and then in 'sounds and multimedia' then 'devices'. (But don't know how to remove them.) Spot will probably answer that when he gets a chance.

Thanks guys, I really do appreciate the help.

Getting back to the "In Line" thing. Most of the videos I record are only a few minutes in length, so I don't think syncing will be a problem. Can it even be done in Vegas though?

Yes. Record the audio separately. (48,000 Hz) and bring it into your video timeline. You can move it around until its in sync. (you can even stretch it or compress it-"Time expand"- to fit, if you have to.) You'll have to set up your audio recording properties to find the RCA jacks. Just record the audio only, know where to find the file and then open your video project and bring in the audio file and line it up. You'll probably have a blank audio track with your video, but just open another audio track, underneath, and bring in your new audio and sync it up. If you've never recorded audio only, you'll have to get out the instruction manual. To much detail to write here.

Oh, darn, I thought I could record using "Line in" through Vegas. You see, the problem is that I record the video "live", so I can't record the audio and video separately.

Well, if it's short. Record it to tape. Then put it into the computer separately.
It may be as Spot said, that you may need to move your 1394 card to a completely different location. Personally, I installed a USB 2.0 card, about a year ago, and I had to move it twice before if worked. Then it worked as if nothing was ever wrong. Go figure.

I'll try the moving the card thing for sure. Do you really think that might be the problem, even though it worked earlier?

Thanks again for the help.

If you have Pinnacle anything on your system, I'd be removing that, too.

I was hoping to get back here before you answered. No I don't. I'm troubleshooting and when I get an idea, sometimes I forget some pertinent information that should be obvious. The only other thing I can think of, and I'm no Spot, who's a real expert, is to do a serious disc scan for errors. This usually takes a while, as you may know, so do it overnight if you're real busy with the computer. The only time I ever had mysterious problems happening with Vegas, that's what fixed the problem for me. Something got lost and the scan found it and put it back. Be sure to click the box that says 'Fix errors'. After this, if it still doesn't work, I'm tapped out.

Sorry to ask, but how do I do a disc scan?

It's right next to 'Disc Defrag'. Go to 'Start' then 'Programs', then 'Accessories' then 'system tools', then 'ScanDisc'. Then check 'Thorough' , check 'Automatically fix errors', look at the 'Options' window. Be sure the 'Do not repair bad sectors in hidden and system files' is NOT CHECKED. The only thing that should be checked on this window is 'System and data areas'. I have an older operating system, so the words or phrases may be different if you're using Windows XP. Just be sure it's a 'Thorough' scan and 'auto fix errors' is on and scan mostly the harddrive that has Vegas on it. (I have a separate hard drive for AVI files and never have to scan that, but my main drive does need scanning from time to time.)