Hi,
which CD-Player and Operating System are you using? (Please also post your Hardware Setup in Signature field)
This issue is described in the Quick Installation Guide, as CD-Player and Turntable need different Sound INPUT settings.
Example for CD-Players and Windows XP:> System Settings > Sounds and Audio > Audio > Sound Input (recording)
Here you need to minimize the Volume (as the signal is louder with CD-Players):

Now CD-Player control should be fine (incl. Scratching, Looping, Cue-Points, Pitch bending)
Let me know if it works fine now.