I'm quite new to mel, I have something relatively simple.
I'd like to create a custom attribute that through an expression, would drive the y positive position of one object,
and the y negative position of another simultaneously as I middle click drag the attribute from left to right.
Now here is the tricky part, I don't want it to simply take over control of the specified channels. I want it to add to the current position, so that I can freely transform the y position of the objects, but add to the end value with the help of that attribute.
Could anyone shed some light on this? Much appreciated.