Parameters are not changing if the parameter driver is place in the sitting controller.
Nothing happen.
You can try this avatar.
avtr_269786cf-81cc-4205-b759-a9e6e7b9c678
First wrong thing. it's set to 25% when you sit in a chair when it should be 18%
Second, you can't open the radial since the parameter Go/Pose is not TRUE.
It's not TRUE since the parameter driver don't work in the sitting controller.