Arm controllers include CrossSwing, Swing, and Bend.
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CATMotion Editor >
Hierarchy panel > Expand the HubGroup hierarchy to which the arm belongs. > Click the controller to edit.
CrossSwing
CrossSwing controls the angle of the arm out from the body (arm Y axis). It is used in conjunction with Twist to tune the way the arm curves around the body as it swings.
Swing
Swing controls the rotation of the arm backwards and forwards, parallel to the body.
Bend
Bend controls how much the arms bend at the elbow.
Tip: You will probably need to edit both knots to make sure that the elbow is bending correctly. For example, with a human, knot 1 could have a value of -64 and knot 2 could have a value of 24.