wildbill,
The Geckodrive G201 is a 10 microstep driver, whereas the BED can be set to a variety of step modes.
I have not seen any definitive statement that the AccelStepper library will work. Some references that is "should"
I just learned that the Geckodrive G201 takes the +5v to Pin 10 (http://www.geckodrive.com/g201-rev-16), which is called "common" I have always thought of common as a ground, which is obviously wrong. I can't wait to get home and see if correcting this works.
I will report my results!