Basically, you should stop Digi CAM from running using Activity Monitor and then delete it along with its support files. Here is a good step-by-step:

https://uninstallmacapp.com/digidesign-coreaudio-driver-removal.html

However, as pointed out in step #3, there will be other files to delete in addition to the driver itself. I use and recommend AppCleaner. It's free. You just drag the DCAM onto the AppCleaner window and it instantly finds all those other files that you would otherwise have to search for manually if you just dragged the DCAM to the trash. Note: it does NOT automatically delete anything. It shows you all the files and you then tell it which ones you would like to delete.

http://freemacsoft.net/appcleaner/

If you have any more specific questions after reading the article, please let me know. I used to have a Digi002R and loved it but I had to finally get rid of it due to instability with recent OS's. It was several years ago, but I believe there was an uninstaller in the Digi app folder...or an installer that will give you the option to uninstall when you launch it.

BTW, have you had any luck going into System Preferences > Sound and selecting internal (or another interface) for both input and output?

UltraPAK 2021, 27" late 2012 iMac, 16 GB RAM, OSX 10.15.7
Logic Pro X 10.6.3