Pioneer CDJ-850, Multi Player TRAKTOR PRO/PRO 2 manual - page 6

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5 Select [Delete] from the pull down menu.
6 Click [Yes] when the popup window confirming if you would like to perform the operation or not is
displayed. The old version of PIONEER_CDJ-850.tsi is deleted now.
To import the new version of the MIDI mapping file, see “’Using the Multi player as a TRAKTOR PRO/
PRO 2 controller” on page 7.