If they have installed Audacity and included the “VST Bridge”, then it is possible that they have purchased “Antares AutoTune” and this is what you see in the effects menu. I think that there is a good chance that the Audacity developers would consider including it future releases of Audacity if it were released with a GPL compatible licence. If they have written their own auto-tune effect, perhaps you could persuade them to release it publicly (it would be excellent publicity for them). Audacity also supports Nyquist plug-ins and LADSPA plug-ins which are both open formats, so with a little programming experience it is possible for anyone to write their own plug-in effects. It is possible that they may have written their own auto-tune effect - Audacity is an open source program, which means that anyone is allowed to download the source code and develop it in anyway that they wish.

For GSnap to work effectively, the input signal should be monophonic, at a good level and reasonably noise-free. It can be used subtly to correct the pitch of a vocal, or, with more extreme settings, to create a robot-voice effect. When you select the “auto-tune” effect, does the effect state any copyright or author information? Download GSnap Auto-tune Pitch GSnap is an auto-tune effect.If it is “Audacity”, could you find out which version (Click on the “Help” menu and select “About Audacity”).Are you sure the program that they are using is “Audacity” (not to be confused with “Audition” which is a $600 commercial audio program).I wish you could show me - I think there would be a lot of demand for an auto-tune effect in Audacity.

Best auto tune for audacity