Free · Pulse sound up and down

Tremolo Voice Changer for Kids

Turn a sound up and down in gentle waves or quick helicopter-like pulses.

Clear, kid-friendly steps
Private in your browser
No signup

Real Web Audio effects

Tremolo voice changer

Turn sound up and down in a smooth, repeating pulse.

Quiet and readyTremolo

1TremoloVolume pulse

intensity 0.434 · rate 2 · stereo phase 60

DryEffect

A slow wave that keeps sound clear.

Use headphones before the microphone.They prevent the changed sound from feeding back into the mic.

Shape the effect

Project nameDemo pitch · 220 HzOnly changes the built-in demo tone.Demo tone shapeDemo length · 3.5 secondsEffect mix · 56%Move from original sound to changed sound.Effect strength · 38%Movement speed · 2.0Repeat amount · 38%Tone color · 50%Lower is darker. Higher is brighter.Project color

Save the effect settings

Keep a readable recipe, a spreadsheet, or an editable project on this device.

Three simple steps

How to use it

Pick a ready sound, then press Play demo sound. Nothing plays on load.
Move one effect slider and listen again. A microphone is optional.
Save a readable recipe, settings sheet, or project you can reopen.

Private by default

Your words and choices stay in this browser tab. There are no accounts, uploads, ads, or trackers inside the tool. Close the tab and the working data is gone.