Knob paging allows you to have more than four knobs to control, even though the hardware has four physical knobs on it.
When using the BEACN App, pressing the + button allows you to add more knobs, based on virtual USB audio devices or attached hardware devices and use the < and > buttons to move between "pages" of knobs.
You'll notice that if you have only four knobs assigned, the < and > buttons will be unlit.
When you add a fifth knob, the > button will light, indicating that you have more knobs available. Pressing the > button will move the existing knobs over and expose the newly added knob. Knobs move in groups depending on how many unseen knobs there are. Here's a couple of examples to help illustrate what that means. Brackets = (screen area)
(1 2 3 4) - Only four knobs and the < > buttons are unlit
(1 2 3 4 ) 5 - Five knobs and the > button is lit
In the above example, pressing the > button will move the 1 knob off the screen to the left and add the 5 knob into the far right slot.
1 (2 3 4 5) will now be shown on the screen and the < button will light, showing that the 1 knob is now accessible by pressing the < button.
(1 2 3 4) 5 6 7 - Seven knobs and the > button is lit
In the above example, pressing the > button will move the 1 2 3 knobs off the screen to the left and add knobs 5 6 7 to the screen.
1 2 3 (4 5 6 7) will now be shown on the screen and the < will light, showing that the 1 2 3 knobs are now accessible by pressing the < button.