I read about Robert Taub’s ImproVox a couple days ago and decided to give it a try. This iPad app is a blast, adding all kinds of texture and harmony to your voice as you sing. I love it and could entertain myself for a long time with the effects and the sounds made by tapping and scrubbing the iPad case while it is on. I do wish it could export a MIDI version of the results. I’d love to replace voice with instruments to build up a piece.