Manual 10.2 pdf
Pages 28 - 40 explain the front panel in detail .... You must have missed those. If you can't be bothered with all that, here's a start for you:
Module and Section Buttons (3)
These buttons are associated with the modules and section of the signal chain as described in the chapter Rigs and
Signal Chain before. A short press will switch the associated module or section on and off. Press longer to open the
associated menu. Once inside a menu use the <PAGE> buttons to scroll through pages of parameters.
HTH