Add an onscreen volume control and a fade-out and stop transmogrify button
Volume control and separate fade is a great Idea. Volume can vary from track to track, and it is inconvenient to have to change it from the IPad volume button, when you are playing guitar.
In addition, it would be a GREAT feature if you could "auto set" the volume of each track, so that the different tracks in a set list would come up in the player with their volume already set louder or lower, so that there would be an ability to "equalize" the volume of the tracks in a given set list. Also, you could provide an "auto volume equalize" feature so that the Unreal Book player would scan all the songs in a set list, if you desire, and set the volumes of every song to a default equal level. The IPad volume could then be set to a desired level, and the individual tracks would that were Auto Volume Scanned would be at the same level, which would make song to song transition much more smooth.