@mptak said:

Joint names I think need to be unique but you can give them a common controller name or (and I know it is bad practice sorry TT) a common global $variable.

Hmm.. actually I dont understand what you just said. So, do you mean I can try renaming it with "$variable"?

I wanted to rename my joints, so that I can control all of them at the same time. the joints name was chaged in the UI box, but somehow when I pressed the play button, the joints name got back to "hinge (numbers)" again. How to rename it properly???