It sounds like a coal train as the motor seems to be stepping really fast, then at points it moves fluidly, then goes back to rapid steps, then freezes for a second, then goes back to steps.

It's horrendous.

I've had a drink now, but I finish work at 2 tomorrow (then have to weld something for my old man) then will get on to getting as much info as I can about it.

Also, it's parallel port controlled, not USB.