+preview_playing: { note_number: 27 }
+preview_ready: { note_number: 27 velocity: 2 }
+
+# The slider (pitch bend) is mapped to master speed.
+master_speed: { controller_number: 128 }
+master_speed_light: { controller_number: 10 }
+master_speed_light_min: 1
+master_speed_light_max: 15
+
+# Master speed lock is mapped to lock.
+toggle_lock: { note_number: 25 }
+locked: { note_number: 25 }
+locked_blinking: { note_number: 25 velocity: 2 }