How to use MotionBuilder's Control Rig to Edit Mocap

Today we’re going to look at how to use MotionBuilder's Control Rig to edit the walk cycle we created in the last video ( • How To Create a Walk C... ).
The Control Rig is MotionBuilder’s Full Body FK/IK character rig. To get the most out of it without wanting to kill it, there are 3 key things to understand:
How IK Blend works and when to use it
Why editing key frames in the FCurves window can have no effect
What Pinning does do and why it sometimes don’t seem to be doing it.
p.s. also applies to control rig in Maya...