See wiki page for use case and final designs:
https://confluence.nypl.org/display/SIM/Patron+finds%2C+borrows%2C+plays%2C+and+adjusts+settings+for+audio+books+in+SimplyE#Patronfinds,borrows,plays,andadjustssettingsforaudiobooksinSimplyE-2.PatronsearchesforanaudiobookinSimplyE
SIMPLY-87 DESIGN - iOS - Search for AudioBooks