If you are using Notion6 on Mac or Windows, please make sure you have downloaded and installed all of the sound packs from your my.presonus.com account. Then double check Notion is pointing to the correct sounds folder, in Preferences>Audio>Locate
If you are using Notion on iOS, then by default, only the piano sound is included on your first download of the app. To get the rest, go to Sounds, and download the samples you want, or download all.
If you still are having issues, please create a tech support ticket via your my.presonus.com account, and we can help you further
-Chris
