Pioneer Dj DDJ-FLX4 Portable 2-Channel rekordbox DJ and Serato Controller (Graphite) - Manual (Page 28)

Part names and functions
28
En
14 Channel faders
Slide:
Adjust the volume of the sound for each channel.
[SHIFT] + slide:
Triggers Fader Start.
15 Crossfader
Slide:
Adjusts the sound balance between the left and right channels depending on
the crossfader curve setting.
[SHIFT] + slide:
Triggers Fader Start.
 Using Serato DJ Lite
1 TRIM knobs
Adjust the volume of each channel’s sound.
2 MASTER LEVEL knob
Adjusts the volume of the master output sound.
3 Headphones CUE button (master)
Press:
Plays the master sound through your headphones.
4 Bluetooth MIDI indicator
Flashes: The iOS/Android device is not connected via Bluetooth.
Lights up: The iOS/Android device is connected via Bluetooth.
Turns off: The unit has recognized the connection with a DJ application using
the USB cable.
5 Channel level indicators
Indicate the volume of the sound of the respective channels before it passes
through the channel faders.