Very low gain on mic using Parallels trial and Vista on new Macbook Air?

I think it's all in the title. I am trying to use my Macbook air's in-built microphone to record via Windows Vista application on my new Macbook Air that is running the Parallels trial. However, for some reason the recording is very hard to hear. There does not seem to be any issue with the microphone in Lion. Has anyone seen a similar issue/been able to get this to work?

Thanks