XDJ-700 with DDJ-800 and rekordbox

Hello, I need help.
I have 2 XDJ-700s connected to a DDJ-800 which is used as a mixer. I would like to use the Rekordbox library as an "external disk" and have waveform support on XDJ. And now I have a problem because when I connect the XDJ with an etheren cable (Pro LINK), in the EXPORT mode I have to disconnect the USB cable from the DDJ-800 because I have no audio signal but after this I have Audio but dont't have FX effects because they are software. Is it possible to use the DDJ-800 and XDJ-700 with Rekordbox in EXPORT mode?