I apologize for my introductory thread being for a problem, but I feel like I have exhausted all options and tech support feels more compelled to get off the phone than help me resolve my issue. and frankly, I've not had a problem I couldn't solve up until now. windows 7 64bit intel i5-2520 2.5 GHz 4GB RAM New stylus/needle New mixer New control vinyl Decks just back from service ...I have been a traktor user for 8 years. started out on the first version with XP, and it was rock solid for ages. then I upgraded my laptop to the current one, an HP6460b. all of the sudden, deck B would start bouncing all over the place, I'm talking pitch fluctuations that are wild and unpredictable, not like what I usually see when using 1210s and the control vinyl, which has never been an issue. it reports the vinyl is skipping, audio levels are low, etc. here are a couple videos of it: crazy. my first move was to replace my needles, they were worn out. no dice. so, I upgraded traktor to version 2. same problem. so, I took my decks in for a service. minimal work was needed, they are solid. so, I replaced my mixer, because I noticed how low the input levels were in the calibration window. I needed to replace the mixer and needles anyway, but I was hoping that the issue was somehow related to them. still, the same problem with deck B. no issues with deck A. I have basically a new system except for my decks, which have now been serviced by a reputable business and tech. I have tweaked windows per the NI site. I have taken the tech's recommendations and have disabled the network adapters. no fix. I have taken ALL their recommendations, like: USB buffer at 3ms process buffer at 512 etc ..these are things I shouldn't even have to do with this processor and RAM. this DOES NOT happen with regular vinyl, only when using the control vinyl to play files via traktor. I don't know what else to do. I don't want to bash NI, but to call their techs helpful feels like a bit of a stretch. I'm a loyal and previously happy traktor user who just wants to have a mix. I mean I really, really want to have a mix... but I can't, because if I want to play files off traktor, deck B bounces around like someone is thumping the turntable. I have taken every recommendation and have even gone beyond- again, my system is practically new at this point. I am not past taking this particular deck back to the place that serviced it, but I have detailed notes from the tech, where the tone arm bearing was cleaned, lubed, etc. it was binding slightly, but that is reported as fixed. and this just doesn't happen with regular vinyl. BUT I keep coming back to why this only happens with one deck. but not with regular vinyl, only when using the control vinyl and digital files. I've searched the Inet and have not had much luck finding anyone who has had this issue, or the resolution. so, I thought I would appeal to this community. sorry for the book, and sorry for this being my first post.