In the Sunday Keys App, after you've downloaded the Sound Library, you'll see a Setlist of Starter Patches.
A patch is 1-5 individual sounds, and one sound can fit in each of the 5 Sound modules.
You'll navigate to Patches and Sounds in different places in the Sunday Keys App.
How to View All Patches:
If you click on the "+" at the bottom of the Setlist, you'll see an option to "Add a Patch from the Library":
From here you'll be able to view all Patches, most of these have 3-5 sounds:
How to View All Sounds:
You can add or replace sounds in a Patch. A Patch can include one or more Sounds that can be layered together or spread across the keyboard. You can add a Sound to a Patch by tapping an empty Sound Module and browsing to find one you would like or by choosing "Create a New Patch" instead of "Add a Patch from the Library".
Then, give it a name:
From here, you can click on Add Sound in any of the 5 Sound modules:
Here you'll see all the sounds in the Sunday Keys Sound Library: