Being using this app and have been very happy with using on song, very helpful for making set lists.
Recently I found out that on song was taking over 2g of my memory and I was terribly shocked... I found out by plugging into my itunes that the app was making large size backups on its own. After deleting the backups lot of memory was restored but still I was really shocked how this happens..
I do not know how to stop this because my onsong back up is still turned off.
Joekim9000 about OnSong 2020