DDJ SB2 MASTER OUT Problem.

Hello.

Recently i bought a used DDJ SB2 Controller , and i noticed there 2 things.

First when i connected it to pc only VIA PC USB Cable , then started Rekordbox DJ (Tried with Serato and VDJ too) and i was trying to mix , few moments later i noticed that the MASTER GAIN knob does nothing it those programs.

Then i thought , maybe i should connect it VIA Chinch too ,to my Speaker system. Then i  realized that left speaker won't playing. I changed the RCA cables to other ones nothing happened the same problem. Also with the rca cables plugged in master gain didn't work too.

I could mix without a RCA cables and without this Master Gain , but in Rekordbox i cannot setup a proper Latency beetween my USB Audio Interface (Focusrite Scarlett Solo) and DDJ SB2 Headphones out. In VDJ there is no latency betweem theese two cards. Latest ASIO drivers intalled.

I just want so badly to mix on rekordbox , because it's sooo great software!

Thanks in advance !

ps: sorry for my bad english :P