Buttons, surrounding the white box at left, right and top side makes selecting major controls more comfortable for animation rather than clicking on their circles on the image in Face Controls rollout.
R Brow - brow soft|
Top Lid. - upper eyelid soft
Bot. Lid - lower eyelid soft
R Cheek - big soft of the cheek (lower cheek soft)
Corner - mouth corner soft
<Top Lip - cyclic selection from central upper lip soft through all lip directs to the lip corner (you have to press this button several times)
<Bot. Lip - cyclic selection from central lower lip soft through all lip directs to the lip corner (you have to press this button several times)
Place mouse cursor over driver, hold left mouse button, drag-and-drop - that's all you need to move selected control. After mouse up driver is back to the center of box, but control stays in place. Drag driver again to move control more. You can hide all controls, select controls via UI and drag hidden objects by driver.|
Undo - Button to undo last movement of the control by driver. If hold SHift while pressing - 3ds max undo performs too.
Reset - Button to set all controls to reset pose.
H - Restrict Driver Horizontal If on then driver will be moved horizontal only
V - Restrict Driver Vertical If on then driver will be moved vertical only
Driver Sensitivity: - spinner to set driver's sense. Higher values means longer distances of controls movement, while the driver is dragging