Pioneer Dj DDJ-FLX4 Portable 2-Channel rekordbox DJ and Serato Controller (Graphite) - Manual (Page 154)

Additional information
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 Fader Start doesn’t work.
• Set a cue.
• To activate Fader Start, mark the [Fader Start] check box in
[Preferences] > [Controller] > [Mixer] tab in rekordbox for Mac/
Windows.
 When the unit is disconnected, recording isn’t available in
rekordbox.
• If you don’t have one of the relevant subscription plans, you can’t
record without connecting to the unit. Connect the unit or another
Hardware Unlock device, or take out one of the relevant subscription
plans to enable recording.