Originally Posted by
JamesT
go to timecode setup and check the input mode, makesure its correct for either vinyl or cd's...
You say only number three is red?
If your using turntables check your cartridges, play some regular vinyl and see if sound comes out your left speaker, it could be your cartridge isn't wired up correctly
If your using CDJ's try a different RCA cable, it could be that one side of the signal isn't being sent in, therefore traktor wont calibrate.
These are only wild guesses by the way, it could be something completely different...