Open the Mixer Window
Click on the first fader and click learn
Click on Fader number one so the assignment looks like this.
Continue with the other faders in the same way until you get to number 8.
Assign 2 buttons that you will use to bank to the left and the right by banks of 8. Make sure the one to left is multiplied by -1 and the one to the right is multiplied by +1 in the value section at the bottom. Also in the value section set the min to 0 and max to 8. The mode button seems to work now even though they are different for each of my buttons but I would say scaled or relative would be the ones to try first.