The TC Helicon VoiceWorks Vocal Processor is hands-down the best harmony generator in its class. Creates 4-voice harmonies and 4 harmony modes and provides transparent pitch correction and fat automatic double-tracking, all so realistic you can solo them with confidence. It also includes superb T.C. Electronic effects and new HarmonyHold which lets you freeze your backing harmonies while you sing over them. Add a quality mic preamp, compression, EQ, tap-tempo delay, and reverbs and you have a complete vocal channel with 100 user presets.