Comentário oficial
Currently, no, there is no MIDI mapping to those functions, however you could map a keyboard shortcut for it and then use a MIDI-to-keyboard shortcut manager to do what you're looking for.

Hey,
how can i use the Memory Cue & delete function in rekordbox dj / performance with my controller? With a cdj 850 i can use this function but not with my controller. In MIDI settings, i don't find something for this function. My rekordbox version is 4.3.0 for Mac. Hope you can help me.
I'm searching NOT the Hot Cue function ;)
Currently, no, there is no MIDI mapping to those functions, however you could map a keyboard shortcut for it and then use a MIDI-to-keyboard shortcut manager to do what you're looking for.

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This might do better in feature requests, but I would love to be able to use SHIFT + (Memory Cue Left) to Delete and SHIT + (Memory Cue Right) to set.
Hmm, don't see any Midi function for 'Memory' or 'Delete'. Hopefully Pioneer improve the mapping functions over time