http://www.usaudiomart.com/details/649382047-phoenix-engineerimg-roadrunner/
I have been playing around with my Roadrunner as well. Its quite handy for seeing the effects of environment and handling has on the speed. I never liked swapping a belt from 33 to 45 and back on the pulley. Seeing how much it can vary after switching back, it justified, to me anyway, going the added cost of having a power supply made that allowed switching voltage not the belt and having a pulley made to run 2 belts. Variance of .003 is pretty solid IMO.
I have been playing around with my Roadrunner as well. Its quite handy for seeing the effects of environment and handling has on the speed. I never liked swapping a belt from 33 to 45 and back on the pulley. Seeing how much it can vary after switching back, it justified, to me anyway, going the added cost of having a power supply made that allowed switching voltage not the belt and having a pulley made to run 2 belts. Variance of .003 is pretty solid IMO.