Fly's advanced functionality lets you change the key to suit your voice and the tempo to your preference. You can also import your own audio multitracks that you've created or sourced from other providers. Plus, you can dynamically change the arrangement by using 'jump keys' to go to a specific verse, chorus, bridge or ending. Fly lets you create as many versions of a song as you like, so you have much more flexibility than with any other worship band software.