hello! I just received my mixed through the door today a pioneer 850k djm. i am a noobie with the whole setting up part so i youtubed some videos and i noticed that there are only 2 phono inputs on the back for turntables, however I am going to be running 3 turntables and I do not see another phono plug in only a cd/line and line in the other two. could anyone please help if these will work or not? thanks!