Made by IK Multimedia, the VocaLive iPad/iPhone app is designed for you to sing along and record with your iTunes music library.
With its voice cancelling feature enabled, VocaLive allows you to record your own vocals over your favorite songs. To add some spice you can warm up your sound with the included vocal tools giving you a complete portable vocal solution.
VocaLive can be used with the built-in iPad microphone, earbuds with built-in mic, or with IK's iRig Mic if you would want better results. The included audio recorder of VocaLive for iPad can be expanded to an extremely flexible 8-track mobile studio with easy-to-use volume, pan, insert effects and two send levels for each track along with a full-featured master effects section with with Reverb, Chorus and Delay for track sends, and a global parametric EQ and compressor for final mastering. For further sound processing you have a suite of 5 dedicated real-time vocal effects (pitch correction, choir harmonizer, voice doubler, vocal morpher and de-esser) plus 7 effects tailored to vocal processing (reverb, EQ, compressor, delay, envelope filter, chorus, phazer) that can be combined on a 4-slot vocal rig chain. To help you get up and running quickly, VocaLive comes with dozens of presets.
If you're a singer/songwriter you might also be interested another of IK's apps. AmpliTube will give you an entire guitar/bass rig at your fingertips. Four recombinable simultaneous stompbox effects, an amp-head plus cabinet and a microphone.