Pioneer Dj DDJ-FLX10 4-Channel DJ Controller for rekordbox and Serato DJ Pro (Black) - Manual (Page 31)

Part names and functions
31
En
[SHIFT] + press (during loop playback):
Adjusts the loop out point using the jog wheel.
29 4 BEAT/EXIT button
Press:
Starts Auto Beat Loop of 4 beats.
Press (during loop playback):
Cancels loop playback.
[SHIFT] + press:
Switches the active/non-active status of the loop.
30 ACTIVE PART DRUMS button
Press:
Turns muting of the Drums Stem on/off.
[SHIFT] + press twice:
You can duplicate a track loaded on a deck so it plays on the other deck from
exactly the same point.
Press the button twice while holding down the
[SHIFT] button on the deck
where you want the duplicate track to start playing.
The deck you pressed the button only plays the Drums Stem, and the other
deck mutes the Drums Stem.
31 ACTIVE PART VOCAL button
Press:
Turns muting of the Vocal Stem on/off.
[SHIFT] + press twice:
You can duplicate a track loaded on a deck so it plays on the other deck from
exactly the same point.
Press the button twice while holding down the
[SHIFT] button on the deck
where you want the duplicate track to start playing.