The untweaked iPad has 16 "volume steps" which would be the 100% setting on the Volume Step Cydia tweak. This tweak allows you to have either a more fine or coarse volume adjustments, with 100% being the original Apple setting. With this enabled at 50%, you essentially get twice the volume sensitivity as compared to a stock iPad.
Volume Step is a free tweak available from the BigBoss repo, there is not a new App added to the springboard. There will be a new extension called Volume Step with it being installed Enabled and set at 50%.