Free demon voice changer

A demon voice changer for your live mic: an octave-deep growl with a dark room behind it. Free, no sign-up.

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Before and after

Free demon voice changer

Variation: Pitch -6: still a voice, with the demon's grit and room.
Variation: Reverb off: the same demon, close and dry.

The exact settings

Setting	Value
Noise gate	mutes the mic below -50 dB, between words
Pitch	-10 (lower)
Tone	-5 (sounds bigger)
Distortion	drive 0.35, 50% mix
Chorus / vibrato	wobbles 0.3 times a second, 30% mix
Bass	+4 dB below 120 Hz
Reverb	25% mix, 2.5 s long

More about this voice

What each part of the demon does

Part	Setting	What you hear
Depth	Pitch -10	Almost an octave down, below any normal speaking voice
Size	Tone -5	A chest and throat far bigger than a person's
Grit	Distortion 0.35, half mixed in	A rough edge on loud syllables
Swirl	Slow chorus, 30%	Two voices slightly out of step, like a possession
Room	Reverb 2.5 s	A cathedral or pit around every line

Make it scarier, not just lower

Talk slower than you think you need to. The reverb fills the gaps, and a slow demon is scarier than a fast one.
Let lines end in a breath or a hiss. Breath goes through the effect too and comes out as a growl.
Leave a pause before the punchline. With 2.5 seconds of reverb, the silence does half the work.
If people can't follow you, try the Pitch -6 clip above: still demonic, much easier to understand.

Demon, monster or villain?

All three are low. The demon is about space: the reverb and the chorus make it sound like something speaking from somewhere else. The monster is about size and growl, close to the mic. The villain is a person: lower and smoother, but clearly human. Pick the demon for possession, ritual and horror roleplay, where the voice should feel unnatural.