Pioneer Dj DDJ-FLX4 Portable 2-Channel rekordbox DJ and Serato Controller (Graphite) - Manual (Page 25)

Part names and functions
25
En
Mixer section
 Using rekordbox for Mac/Windows or rekordbox for iOS/
Android
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.
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