: While primarily a real-time singing synthesizer, it excels at various robotic and non-human vocal timbres. It is often cited as a powerful free option for "unnatural" vocal sounds.
: Shift your vocal up or down significantly to create the "unnatural" base. Bitcrusher : Use a tool like MeldaProduction MFreeFXBundle
If the above don't fit your workflow, consider these other options:
: Place a stock pitch correction plugin on your vocal track.
: A free, open-source plugin that offers a wide range of bit-crushing and downsampling effects. It's known for its high-quality sound and flexible interface.
: Many producers suggest using KeroVee (a free pitch correction/vocoder plugin) followed by a bitcrusher like Redux or a free equivalent.