Pioneer Dj DDJ-FLX10 4-Channel DJ Controller for rekordbox and Serato DJ Pro (Black) - Manual (Page 22)

Part names and functions
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[SHIFT] + press:
Playback returns to the previously set loop in point and loop playback resumes.
[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. (Active Loop)
• During playback, the loop nearest the playback position is set to active.
• When you call up the loop, the called-up loop is set to active or non-active.
30 ACTIVE PART DRUMS button
Press:
(When Mute is set), turns muting of the Drums part on/off.
(When Solo is set), outputs only the Drums part. Press the button again to
output all parts.
• You can set the [Preferences] > [Extensions] > [TRACK SEPARATION]
tab > [ACTIVE PART setting] in rekordbox.
[SHIFT] + press twice:
Part Instant Doubles
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 part, and the other deck
mutes the Drums part.