hey man,thank you very much for all the information. I tried everything out and came to a conclusion.
as you said i checked the faulty of Traktor Audio 2 and it turned out to be fine. i have 2 of them so either has to be fine.so i ruled it out.
When checking the mixer channel 1 turned out to be fine and Channel 2 fader was working the otherway around. (when i turn down the fader volume increases)
so there is that
and tracktor seems to be completely fine.
There is no firmware update for A2 ,so in conclusion it come backs to yosimite update. i read this forum and NI forums and i came across this which could be the solution.
https://discussions.apple.com/thread/6623697
it seems much work ,should i go for a technician or do it by myself. (i cant afford to screw it up lol )
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