Physical modeling vocal design plug-in.
Put Antares' THROAT Evo plug-in on a vocal and you'll be amazed where you can take that voice! THROAT actually lets you use vocal-tract modeling to shape the sound of a vocal; you can make male vocals sound female and vice versa. You can make a singer's part sound breathier, raspier, or even take it down to a whisper. THROAT's amazing controls even let you take vocals to physically impossible places, for great effects. If you do your own backing vocals or just want to tweak existing parts, then you'll love what the surprisingly affordable THROAT can do for you!