I'm studying now scratching with online-course with my Traktor Kontrol S4, when I turn jogwheel back to starting beginning I dont get same sound that in the course no matter what I do, even I have the same sample than in video, it sounds totally different..:( Im wondering if the reason is difference between traktor and serato, or the jogwheel or I have to adjust some of the Settings? Jogwheel is in Turntable-mode and key is not locked but I just cant get smooth slow scratch like in the coursevideo when turning the jogwheel anticlockwise..