then connect the midi solutions box to the midi in of the yamaha.
The question is as to whether or not the yamaha will respond to sustain via MIDI (it should). A quick way to validate this is to temporarily use another keyboard that has a sustain pedal input, connect a sustain pedal to that keyboard, then connect the midi out of that keyboard to the midi in of the yamaha. Have the other keyboard send sustain via CC#64. Then play the Yamaha and use the sustain attached to the other keyboard, it should send a sustain message through midi to the yamaha. if the yamaha responds to the sustain message and sustains then you can go the above route, otherwise you are stuck.
Page 112 of the owners manual indicates that the DJX responds to CC64 so the above solution of purchasing the midisolutions box will work.
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