Hi just got Skratch a few days ago and when I first put the control cds into my cdjs I noticed an odd high pitch whirring sound. At first i thought my cdjs where knackered but then I thought about it and the chances of both of them going at the same time was pretty low so I tried other cds an the whirring sound wasn't there. So I decided the best thing would be to copy them to blank cds which worked and does the trick. But as I was copying them in my pc the cd drive was also making a similar whirring sound. Its not a big problem as my backups of them work perfect. Just wondering what could cause this . (Happens with both the Control CDs by the way) could they be warped or something?