I did experience it with an old worn out 1200 where the platter disc was so uneven.. it played regular vinyl just fine but serato played it very slowly backwards no matter which way the rca cables was connected

hmmm. At first I thought it was my TTX. But it was not. I have never seen this on Serato until now. I have seen it happen with Traktor Scratch...

The weird thing is that I can reproduce this each and every time.

Yes, if you plug the turntable's RCAs in backwards (i.e. red into white, white into red) the songs will play backwards (or it will scroll through your tracks/crates). This is true with ALL timecode vinyl programs. This is because your are reversing the phase of the control signal, so the program "thinks" you are the end of the vinyl and going back towards the beginning, hence it plays backwards.

This will also happen if you needles' are not wired correctly, or basically if anything along the signal path from the control vinyl to the input of the SL1/57 is crossed/backwards.

i've seen it happen several times when it *looks* as if everything is hooked up correctly too...you just have to go through and make sure all your connections are nice and tight.

to add what Konix said, it can also happen if one channel falls out suddenly.

oh, wow... I didn't know that if one channel falls out it can happen. How does one prevent a channel from falling out?

You can only minimise the probability... Use good cables, good turntables, good needles, good headshells.. clean the contacts... etc etc.

fair enough. I had also seen this problem when I had the SSL V1 box. It was at a birthday party I did for a Brazilian exchange student. I was using a Denon CD player to control the music.

I am now using Monster Cable for my RCAs. My needles are Shure M-447s. Also I have been treating my timecode with Groove Glide, which by the way seems to clean up the signal.