What is above the potentiometer knob?

[azzo]

On the back of the Remote Controller there is a nob above the potentiometer knob, what is it for?

 

[wattsn]

7th channel. No longer active on Vision+

 

[azzo]

Thank You

 

[M.Tigelaar]

With some help, you can activate it :mrgreen:

http://youtu.be/n_BCFMs-Yeg

To do it :
http://youtu.be/TX3MaGIqqCc