In case you installed Absynth 4 by running the Komplete 5 installer on Mac in custom install mode (i.e. not Easy install mode), the samples of Absynth 4 may not have been copied to your hard drive.
In this case, Absynth will show a message about missing samples when trying to load some of the sounds.
In order to fix this, you can download the sample folder separately from here.
How to use the downloaded file:
- Unzip the downloaded zip file
- Place the resulting folder "Samples" here: Macintosh HD > Library > Application Support > Native Instruments > Absynth 4