ockham: I'm personally much more comfortable selecting the real world master. Rather than using the BODY section. When I say "Real World". I mean in the real world you go to the steering wheel in a car to turn the tires. To do this in Poser. The code is all handled by the Tires channels. Just a personal prefrence. That's all. But I also see somthing else as a benefit for using the BODY section to host all this ERC stuff. By doing that. You can use the regular poseing dials and the ERC will not take effect. I'm not sure if this would be needed much. But I do see a rare case where if you wanted to make an animation where a car crashes because the man inside turned the steering wheel. But the tires didn't turn. So he crashes. You could do that if all the ERC stuff was isolated under the BODY section. Bloodsong: I was putting the five new lines in both the Master and Slave. That's why it wasn't working. Here's an example animation that shows the by spinning the steering wheel. The left tire both rotates and translates in relation to the movement of the steering wheel. Done with the Y rotate dial in the steering wheel. I've never really played with this stuff much before. ScottA