Pioneer Dj DDJ-FLX4 Portable 2-Channel rekordbox DJ and Serato Controller (Graphite) - Manual (Page 16)

Part names and functions
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Press (during loop playback):
Adjusts loop out point using the jog wheel.
3 4 BEAT/EXIT button
Press:
Starts Auto Beat Loop of 4 beats.
Press (during loop playback):
Cancels loop playback.
[SHIFT] + press:
Sets/cancels the loop nearest the playback position as Active Loop. This is
enabled for loops saved on the track or set in Hot Cue mode.
• If Active Loop is set, the loop playback automatically starts when the
playback position reaches the loop in point.
4 CUE/LOOP CALL  button
Press:
Selects and calls up the cue point or loop point.
Press (during loop playback):
Halves the loop playback length.
[SHIFT] + press:
Deletes the called-up cue point or loop points.
5 CUE/LOOP CALL  button
Press:
Selects and calls up the cue point or loop point.
Press (during loop playback):
Doubles the loop playback length.