I have the same issue, having it plugged into a Sony GTK XB7. This isn't working.
DDJ 1000 no sound through speaker
I just bought the ddj 1000 and I connected all the cables it came with. I plugged it in to my laptop and updated rekordbox. Everything works fine just for some reason there is no sound coming out of my speakers I have connected. The sound comes out of my laptop not my speaker. I have it connected to the master 2 with rca cables on both ends.
https://cdn.pioneerdj.com/-/media/pioneerdj/downloads/drivers/ddj-1000/ddj-1000_100dmg.zip I'm not sure if this link will work for you but I dont really remember what I did. I just called pioneer nd emailed them nd they sent me this link showing me step by step what I had to do. It was kinda confusing.
I think it depends on what laptop your using also?! https://forums.pioneerdj.com/attachments/token/Wq6gcWojohybpmxnH6rxsCgkt/?name=Mac+OS+High+Sierra+10.13+and+Mac+OS+Mojave+10.14.pdf .I think its different for windows. Hope this helps at least a little! I was irritated when I didn't know what was wrong haha!