Change, modify, alter your voice with using the several audio effects presented in this app (i.e., pitch shifting, time straching, fast, slow, backward, reverb, helium, hyper, chipmunk, robot, cyborg, whispering, psyco, possesed, bee, alien).
Moreover it is also possibile to add a fake environment sound in order to make your prank call perfect (i.e., police siren, rain, storm, seaside, bathroom, disco, war).