I'm wanting to set up a driver that allows a slider (built of bones) to drive the value of a shape key on my character mesh. However I also need this to be a two way connection and for the value to be altered and for this to move the slider accordingly.
I've got it to work in one direction just using a simple averaged value driver but at the minute that turns the value purple and locks it, meaning that I cannot tweak it manually.
I'm using 2.58
Any Ideas? What am I missing?