You need to download the core audio drivers for your Rane sl4
You can get the drivers here
http://DJ.rane.com/support/downloads/Go down the page to you see the sl4 drivers
After download & install driver ....reboot your mac
Then you see the Rane sl 4 drivers in the Mixvibes audio set up
You also have to change to external mixer mode...( not simple stereo
By look off the pic.)
By the look that the top pic..you need to do another copy off the time code ...you should have a track on the c.d....( the old time code c.d used to have two tracks on the c.d,s ...don't know about the new ones)
What did you rip the download time code file to...try WAV audio file