Reply #6: Also known as pitch-correction software.

[Systematic Chaos]

It's software that automatically corrects the vocalist's "pitch" so they're hitting every note perfectly. Use it with someone who has excellent pitch and you can barely tell it's there (but you still can if you listen closely enough). Use it with someone who sings like a rusty hinge and then it sounds like the worst recorded telephone voice ever trying to mangle a song.

I fucking hate it. And I love when Silverchair came right out on their Diorama CD a few years back and put a note at the end of the credits stating that they don't believe in the shit and will never use it.