[DanL]

I'm confused.

First of all, are you connecting the Edubot to the RC, or the Edubot's servos?

If the latter, the 4-pin servos that came with the Edubot are modified servos. They've been modified so that they act as variable speed motors instead of servos. If it says "IFI Robotics: Multi-Speed Motor," you're looking at the modified servo. If this is the case, it sounds like you're trying to use these guys as normal servos, which won't work.

You'll need to wait for one of the RC guys for details on exactly what that 4th wire does (I'm sure its somewhere in the IFI docs). All I know is the 3-wire servos that came with the Edu kit are normal servos, and the 4-wire servos are the IFI modified servos.