Free · Dark sound to bright sound

Sound Filter Sweep Lab for Kids

Move a low-pass filter and hear a rich tone open from dark to bright.

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

Real Web Audio effects

Sound filter sweep lab

Move a real low-pass filter from dark and soft to bright and open.

Quiet and readyFilter

1FilterLow-pass filter

frequency 518 · resonance 8.06 · gain 0

DryEffect

A low filter that removes bright sound.

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 · 82%Move from original sound to changed sound.Effect strength · 42%Movement speed · 3.0Repeat amount · 38%Tone color · 15%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.