Hammond organ
The sounds that the manuals and pedalboard make are controlled by switches called drawbars. You can pull them out to make the sound louder, or push them in to make the sound softer. Each manual has nine drawbars that control different parts of the sound. The drawbars on the left side control lower sounds while the drawbars on the right side control higher sounds. The pedalboard has two drawbars, and they both control low sounds.