I can capture video into FINAL CUT from VHS deck via ADVC-300, but there is no audio. Is this common?

The vhs ribbon is not well aligned in the vhs tape head. IT can be adjusted for re alignment. Ask for a repairman if you can't do it.

It sounds like there's dirt or dust got into the heads of the VCR. Try cleaning with Servisol Video 40.

How did You connect Canopus? Canopus has 2 Firewire slots - on the back and on the front. If You connect FW cable to a front slot, then, Canopus will not work. Only with external power supply. I´m offering the next proceeding:
1. Connect ADVC with FW cable 6 to 4 to Your macbook via back FW slot. The ADVC lights will now on. On front panel by default light is on mode "digital". If the light don't work - it's a Canopus problem. If light is up and working, then next step.
2. Go to apple menu-about this mac - more info - firewire. You MUST see here Your Canopus a a device. If so, go to the next step.
3. Connect Your VCR to analog inputs, on the front panel of Canopus.
4. Run FCE. If it says "apple firewire device is missing" then is something wrong with Canopus. If not, proceed to next step.
5. On the top of the front panel of Canopus, press button. The light changes from digital to analogue.
6. Press apple+8, then capture settings. Set the firewire device as uncontrollable device. Make sure that in capture window is "vtr ok". Turn the VCR on
7. Press the play button on capture window. In the window appears the screen of Your VCR. Then press play on VCR and then "capture now" on capture panel. Voila! Must to work.

No, you have to capture a signal in format it is generated, save the recording and then do 'transcoding' into different format. Search web for free transcoding utilities.

The device requires 5V 2A to work, it doesn't work with less than 2A.

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Capture it as a standard video clip (with audio), then export the audio track out of Final Cut. If you export as 48 KHz, 16-bit stereo, then there should be no loss in quality as the output is the same as the captured input.

Change the DIP switch to PAL, unplug the unit (no power), then plug it back in. You need to power-cycle the unit to after changing DIP switch settings.

Also make sure that your capture application is set to PAL mode, if there is a NTSC/PAL setting.

this just happened to me tonight...whats going on?? is this some recent leopard related error?

iMovie or Final Cut Pro should work.