A usb parallel adapter won't give you the voltage you need to control the Grinch so no, it won't work for you.
However, you could still use the Grinch by using a Ren-C converter, which uses a serial output from the computer. The Ren-C would plug into the Grinch (the computer into the Ren-C, the Ren-C into the Grinch) and it would also add the capability for dimming all of the Grinch's channels... so all is not lost!
The Ren-C can work with a USB serial adapter or the straight serial output from the computer if the laptop has a serial port.
A Ren-C is inexpensive to build -- there might even be folks who have an extra that they might sell. wjohn has the circuitboards for it.
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