Audio Problem from Analog video

Ok the basics are, I'm working with iMovie 4.0.1, Quictime 7.0.4 and video input from a vhs deck thru a Director's Cut DV converter box which is connected to my G4 via firewire and connected to the deck via the RCA jacks.
When Previewing the tape all is well and there's no perceivable issues.
Once imported into iMovie, there's a major audio buzz over the tape's audio making it unusable. I can hear the tape's audio faintly through the buzz. The video quality is fine. Any ideas on what's causing this? Third party apps, etc?
Thanks
Eric

Lennart, again you are the master. Your link led me to this link, http://www.miglia.com/Support/dctechfaq.html which tells me some unfortunate info.
For ease, here's their FAQ on the subject---
Q: When I import video with iMovie, the audio sounds fine during import. Once I play it back, there is a background noise that covers the audio track.
A: This issue is discussed in an Apple KB article: http://docs.info.apple.com/article.html?artnum=42979
One workaround under iMovie 3/4 is to extract the audio from the video in the timeline.
If you own a Director's Cut Take 2 with a serial number starting with 70xxxx or 71xxxx, you can purchase a firmware chip that provides a workaround for this iMovie issue.
Units with serial numbers starting with 72xxxx or 172xxxx have the firmware workaround already built-in.
Note that the firmware update is not compatible with the D-10 model manufactured by PowerR.
I called Miglia, which now handles PowerR converters under their own name, and they will sell me a refurb at discount since I got this converter VERY early on.
I will have to check with them to see if iMovie 5-6 addressed this issue and corrected it as upgrading is cheaper than buying a new converter, and extracting the audio isn't going to work for a lot of what I do. If anyone knows if upgrading to iMovie 5 or 6 fixes this issue, let me know! =)
Thanks again Lennart!

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