Use the 3 to load layouts like Presets, Scenes, Effects. Use the 12 for the Presets, Scenes, etc.
Presets Layout: 10 presets, Tap Tempo, Tuner.
Scenes Layout: 8 Scenes, Tap Tempo, tuner, Amp Volume +/-
Effects Layout: 10 Effects, Tap tempo, Tuner.
Looper Layout: 6 Looper controls, 4 Scenes, Tap...