@Mike - the Onstep is very interesting. I am a tinkerer and some electronic skills, and have previously built various circuits including my own dew heat controller. Therefore I am quite tempted to give Onstep a try - sounds like I can get a lot of what a CP4 or CP5 can do at a fraction of the cost. The difficulty though I suspect, with a project like this, is the lack of documentations - I do not know what stepper motor or geared motor is in my Mach1, and I also do not know the pin out of the various connectors. I suspect this is going to make it hard to adapt Onstep onto the Mach1...

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