Pioneer Dj DDJ-FLX10 4-Channel DJ Controller for rekordbox and Serato DJ Pro (Black) - Manual (Page 24)

Part names and functions
24
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 Using Serato DJ Pro
1 CUE/LOOP CALL  button
Press:
Selects the loop slot.
[SHIFT] + press:
Locks the loop slot.
2 CUE/LOOP CALL  button
Press:
Selects the loop slot.
[SHIFT] + press:
Deletes the loop slot.
3 MIX POINT SELECT  button
Press:
Lowers the key of the track.
4 MIX POINT SELECT  button
Press:
Raises the key of the track.
[SHIFT] + press:
Selects another deck displayed on the Waveform mode screen of the On Jog
Display.
5 MIX POINT LINK button
Press:
Turns the Key Lock function on/off.