[Bluemoon]

I presume you mean Digidesign Coreaudio. Plain Coreaudio is Mac's system, and PT, and Digi h/w don't use it. You can't find it because there isn't a setup page for individual apps anymore, and you wouldn't be the first to scratch your head, and ask why? Basically the new driver will allocate the resource to the first compatible app. that you open. Change all the settings in System Prefs to your Digi device, and they should work automatically.

iTunes, Reason, B4, Lounge Lizard, GPO etc won't work standalone if you turn the device on after launching the app, as they default to coreaudio (mac) if they can't find the h/w, or simply won't work, and they stay like that until you retsart or shutdown/reboot.

I've also found that if you use these things for a while, PT can be very glitchy to non-existent, i.e. launch quits. So I always Restart before launching PT.