Graillon 2 by Auburn Sounds is a free Pitch Correction plug-in (VST / AU) with optional premium features.

graillon2-jpg

Intro Video:

Review by BPB: Auburn Sounds Releases Graillon 2 Free Vocal Processing Effect - Bedroom Producers Blog

Download link:

You'll find downloads and sound examples here:
>>> Auburn Sounds - Graillon, live voice changer <<<

Graillon 2 is available for macOS & Windows, VST & AU, 32-bit & 64-bit.