Channels are the keyable attributes displayed in the Channel Box. The Channel Box provides a convenient way to edit a bone lattice flexor’s channels.
By default, the effects specified by the bone lattice flexor channels are driven by the child joints of the joints whose bones you selected for them when you created the flexors. This is what you would usually want for most character setup situations. However, you can assign any other joint in the skeleton to drive them. (See Reassign bone lattice flexor joints.)
To edit channels with the Channel Box
 -click
            and move the mouse to the left or right. By moving the mouse, you
            interactively change the value of the selected channel. As you move
            the mouse, note that pressing the
 -click
            and move the mouse to the left or right. By moving the mouse, you
            interactively change the value of the selected channel. As you move
            the mouse, note that pressing the   key gives
            you finer control, and pressing the
  key gives
            you finer control, and pressing the   key
            gives you less control.
  key
            gives you less control.