No, sorry for the confusion, it's no big deal. By "drag sound" I meant the slider noise [normal/soft/drum-sliderslide.wav] present in some skins such as the default and the one I use. Considering you're playing (not editing or test playing) with a skin that has this sound, in the middle of those art sliders, this sound suddenly drops. It's because you've put 5% green points in the mid start of the sliders, (02:42:403 - for instance) and they account for the slider slide sound.
You could select the default skin, put on Auto mod, mute the music volume, and fast forward to that part. Like this it's very easy to hear watch i mentioned. This could be ignored as well, since it's not something many will notice..