Rekordbox и Pioneer DJM 450

Hello. There is a Rekordbox and Pioneer DJM 450

Help guys

I can not understand whether it is possible to do something so that it would be possible to hear pre wiretapping (preview) in the mixer of this record box window from 2 channels.
The fact is that wiretapping (track viewing) is actually heard in the mixer, but only of one channel CH1 or CH2. Or if, for example, to put AUX - then you can hear 2 channels and the whole pre-listen is heard in MASTER

Constantly switch in the settings of something you do not want

How to set up who knows?