Sorry for double-post, but I can't edit the other one. The first scan of a disc got 84 QS, and then scanned again I got 90 QS. Why? Also, with SE3 version it still doesn't show up jitter. EDIT: I just enabled it in Advanced tab. Let's see if it works. But still why the difference in QS in scanning the same disc just after 5 minutes difference? Maybe dirt or vibrations? Now the third scan is 84 again. Also, at which speed should I scan?