I don’t know Express, but
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I don’t know Express, but I do use Final Cut Studio from which it is derived. In there, even if a camera model cannot be controled via FireWire, if it is sending a signal out, the signal if it plays can be captured by hand by using Capture Now, instead of controlled digitizing.
Is the signal not getting into your computer at all, or are you simply unable to control the digitizing process? Can you somehow, USB or FireWire or whatever, get the signal through to your software and manually record?
Also, I think Birdcat uses an SR11, but I don’t remember if he is a Vegas user or even cross platform or knows about a FCE/SR11 issue.