Master Panel at the bottom gives a chance to polish the whole sound altogether, with coloring effects to different reverbs and an extra motion filter to further evolve the sound.
Aside from the panels and play function, you can play the layers through the keyboard as well. The turquoise keys play the bass layer and the red keys play the lead layer.
The engine will play the noise and the ambience automatically whenever you play the lead or bass, avoiding hand fatigue. You can prefer this if you have a certain idea with certain harmony, giving wealth of tonal possibilities.