Hi all. I've a basic question with regards to common return track/controller wiring.  Do the controllers have to be the same type or brand?  From searches in the past I know that each controller must connect to separate transformers but I've not been able to find any mention of the subject relating to controller compatibility.  Maybe it doesn't matter, but I don't know.   My situation is I have a GM UDS panel controller which has two track outputs with switchable inertia/brake and