I have this product, but not the SCART cable as it is not used in North America, so I have no idea how to use that.
I connect the cable to the Red/White USB device, and then I take the Red/White cable connections to the audio parts of the VCR, and the Yellow to the video connection.
I am able to record both the audio and video.
If you are using the SCART connection, I couldn't tell you much as I do not have a way of using that connection.