The Quilcom Multiplier 2 is a free quadruple chorus and pitch-shift vst effects unit. The 4 stereo effects blocks are identical. Each block provides an optional input state variable static filter with adjustable cut-off frequency and resonance. This is followed by an optional chromatic pitch shifter that allows you to select musical intervals for the pitch-shift (with a fine tune setting).
Erzatz is a free VST somewhere between a vocoder and a pitch shifter, Ersatz is a simple effect splitting the signal up to 32 bands and re-generate it as a sinus stack.
Pitchproof – Pitch Shifter | Harmonizer is an audio plug-in that can shift the pitch of the input. The effect is meant to combine old styles of pitch shifting with the quality you expect from modern plug-ins. The result is this pitch “pedal” simulation that has most of what is great about guitar harmonizer pedals, and still preserves the signal’s integrity.
Unstable – pitch modulation likes to mess around with your audio pitch, with 3 subtle pitch modulation modes to simulate the unpredictable but lovable pitch instability of an old tape machine or an analogue synth. Unstable doesn’t only do subtle though, you can also put it in ‘insane’ mode if you’d rather just FSU
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.