It's been a while since I had to animate with Character Studio, but if I remember correctly, there is no way to stop the head and arms from counter-rotating / staying in their current rotation when twisting the spine? Similar for some other limbs/connections. Edit: Basically talking abou this:…
it's been a very long time since i used biped so i may be well out of date.. foot and hand planting can be keyed but otherwise i think you get what you get From what I remember the animators I worked with who used biped tended to just work in the viewport - you can't use the curve editor like you would on something that…