daVerb and daFlange are minimal reverb and flanger audio plug-ins, created with the JUCE framework in C++
Reading time ~1 minute
Is not really required, you can move the files to your plug-in directory and it should work. You may need to delete the plug-in cache for Logic, located at ~/Library/Caches/AudioUnitCache/com.apple.audiounits.cache
~/Library/Caches/AudioUnitCache/com.apple.audiounits.cache