Pioneer TRAKTOR 2 DJM-T1 - Manual (Page 10)

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6
Delete the settings defined in the Assignment Table.
Click [Delete] to delete the selected settings.
Delete all the settings assigned to the [Button/Knob]-[Function] you want to change.
7
Assign a new function to the Button/Knob.
Refer to [Preferences]-[Controller Manager] and [Assignable MIDI Controls]
in the "TRAKTOR 2 Application Reference" manual that is found under Help menu of TRAKTOR 2 for
further details of assigning functions.