Pioneer Dj DDJ-FLX10 4-Channel DJ Controller for rekordbox and Serato DJ Pro (Black) - Manual (Page 29)

Part names and functions
29
En
22 SHIFT button
Press another button while holding the [SHIFT] button to use a different feature
assigned to the button.
Press twice:
Switches between display and non-display of the Digital Marker on the On Jog
Display.
23 On Jog Display

Read more: On Jog Display (using Serato DJ Pro) (page 43)
24 Jog wheel
Turn the top when Vinyl mode is on:
Scratches the track.
Turn the outer section or turn the top when Vinyl mode is off:
Bends the pitch (Pitch Bend – slows down or speeds up the track).
[SHIFT] + turn the top:
Adjusts the beatgrid interval of the loaded track.
[SHIFT] + turn the side:
Slides the whole beatgrid of the loaded track to the left or right.
[4 BEAT JUMP  ] or [4 BEAT JUMP  ] + turn the top:
Fast-forward or fast-reverse the track with extra speed in the direction you turn
the jog wheel (Skip mode).
25 DECK SELECT button
Press:
Switches the deck to be used.
[SHIFT] + press:
Turns Dual Deck mode on/off.