Thomas, it seems that your QY needs MIDI-START/STOP and Midiclock to function. LP16 does not support this and therefore your setup will not work.
But again, it seems to me you are making the setup more complicated than it needs to be.
If you would export the midi information from QY into a regular midi-file (or record it into a DAW and export it), the LP could import that midifile and you would have all the audio as well as all the MIDI playing in perfect sync from LP.