VocaLive lets you create amazing vocal effects by chaining up to 4 effects procesors into a single effects chain, just like you would in the studio. Use VocaLive on stage as your own personal controllable vocal effects processor adding lush reverbs, delays, multi-part harmonies, creative effects and more, all at your fingertips. VocaLive also lets you record up to 8 tracks of audio simultaneously and is perfect for tracking vocals with multi-track class compliant USB audio interfaces.

IK makes some great software and hardware for iOS and Mac.