I took a look through the stepper library, however isn't that for using the PWM option for Arduino?
I'm using the Easydriver 4.2/4.3 so that I wouldn't have to use the Arduino PWM to control the stepper. I should just have to pass it the direction, and number of steps with the proper sequencing.
I'm noticing that the stepper motor doesn't like it if I try to change the speed. The 1000 microsecond delay is pretty much all it will work with.
Do you happen to know how to properly adjust the current setting on the Easydriver? I have moved it around a little, but don't really notice a difference in my stepper performance or smoothness.