ONSONG CHARTS AVAILABLE NOW! LEARN MORE HERE
User Manual
Allow Access
Newer versions o' iOS allow ye t' configure app permissions within th' Settings app after selectin' th' application. Th' followin' items be configurable under iOS 10 or greater:

Media Library
OnSong automatically links chord charts t' backin' tracks contained in yer iTunes Media Library. Under iOS 9.3 and higher, ye may be prompted fer access t' yer library. If ye decline, ye must enable media library access here, savvy?
Notifications
OnSong very rarely sends push notifications, but ye can customize how these notifications will be viewed under this option, matey. Ye can also disable notifications from OnSong altogether, Arrr!
Background App Refresh
While not currently in use, OnSong could update information in th' app upon receivin' a notification. Ye can disable this function here, ye scallywag.
Cellular Data
OnSong be designed t' operate completely within WiFi or access t' th' Internet. If ye be usin' OnSong on a cellular-enabled device, ye may wish t' prevent th' use o' cellular data on th' application level. Ye can disable cellular data use fer OnSong here, Ahoy!