Auto-Tune is a very common effect, but the official plug-in is very expensive. Luckily there is a free alternative which works with Audacity called GSnap.
Download GSnap http://www.gvst.co.uk/gsnap.htm
Installation is very simple. Just extract the contents of the zip file, and copy the Gsnap-GJ.dll or GSnap.dll file to the Audacity Plug-ins folder. Go to where Audacity is installed, “Program Files” or “Program Files (x86)” on windows, locate the “Audacity” folder and the sub-folder named “Plug-Ins”. Paste the .dll file in this folder.
If Audacity was open when you did this, close and re-open it. The GSnap auto-tune plug-in will now be accessible from the Effects menu. It’s usually near the bottom of the list, below GVerb.
Select you clip, go to the Effects menu and click “GVST: GSnap”.
-The defaults are mostly OK, but the 3 main things you need to change are Key, Attack and Release. In fixed mode, click “Configure” and select the correct key. The Attack and Release knobs are how quickly GSnap will snap the note (in milliseconds).
-Min. and Max. frequency are the range of what will be considered to be auto-tuned. 80Hz and 800Hz are usually fine.
-Gate also determines what will be auto-tuned but in volume, not frequency. The lower the gate, the more audio is considered and more possibility for error.
-Speed is the number of times GSnap checks the audio. Higher number = more time, better quality. Lower number = faster, but more jumps in the sound.
-Threshold is how many cents in a semi-tone. Leave it at 100
-Amount is how much of the auto-tune effect will be applies (in percent)
The last 4 options only work if you are in MIDI mode.
-Pitch Bend will distort the pitch
-Vibrato will give approximate wavering in the sound
-Vibrato speed is the speed at which the vibrato oscillates
– Calibrate changes the frequency for a standard “A”. Leave at 440
Read manual http://www.gvst.co.uk/gsnap_manual.htm
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