Hi Yolanda Guerrero-Rebollo,
Thanks a lot for the feedback.
Please take a look into the XPresso tag. There you will find the answer.
To get the XPresso tag, have a Null active and Object Manager> Tags> Programming Tags> Xpresso
The first node is the Cloner. I dragged this object into the Xpresso Editor. Click on right upper red field, to get the Object output.
The next is the MoGraph> Data Node. Right Mouse Click (RMC) in the Xpresso editor gives you access to this. One clone so ID = 0
RMC in the editor to get the Math> RangeMapper, Adapter> Vector to Real.
Drag the jaw_CON+ controller in and click on the red field to get Coordinate> Transform> P.Y
Is this helping? If not, I will make a little video in the morning.
All the best