Samson's technical support provided some help - so I'm posting it here as it may help other people with USB mic problems:
The FAQ was intended for the first edition of Cubase LE.
We don't officially support it so we recommend contacting Steinberg, the company who made the software.
If using a newer version, I'd suggest downloading the ASIO4ALL Driver, which allows you to combine multiple sound inputs and outputs into one driver, and it seems to work best for Cubase. You can download the driver for free at www.ASIO4ALL.com