Free VST pitch-correction. GSnap is an auto-tune effect. It can be used subtly to correct the pitch of a vocal, or, with more extreme settings, to create a robot-voice effect. It requires a monophonic input signal to operate.
Use with subtle settings to nudge off-key vocals back in line.
Extreme settings can create sounds like the famous T-Pain or Cher effect.
MIDI control mode allows you to fit a recording to a new melody.