Why is the output file longer than the input?

The tail seconds extend the render so the last few delay repeats can ring out. Reduce the tail if you want a hard cut.

What feedback value causes runaway?

Above 90 percent the echoes grow instead of fade. The tool caps feedback at 95 percent to avoid infinite self-oscillation.

Not in this release — the current implementation uses a single mono delay line applied to each channel. Ping-pong is on the roadmap.

Delay / EchoLocal

Add a classic delay or slapback echo to your audio. Control the delay time, feedback, and mix.

Drop an MP3 or WAV file here

or click to browse

⎆Your audio never leaves your browser. The effect renders locally via the Web Audio API.

How to use Delay / Echo

Drop a file
MP3 or WAV. The original waveform appears after decoding.
Set the delay time
Short delays (20–120 ms) sound like slapback. Longer delays create distinct echoes.
Adjust feedback and mix
Feedback controls how many repeats. Mix sets the balance between dry and wet.
Pick a tail length
Extra time past the end of the source so the delayed echoes have room to fade out.
Export
Download the processed audio as MP3 or WAV.

Frequently asked questions

Why is the output file longer than the input?: The tail seconds extend the render so the last few delay repeats can ring out. Reduce the tail if you want a hard cut.
What feedback value causes runaway?: Above 90 percent the echoes grow instead of fade. The tool caps feedback at 95 percent to avoid infinite self-oscillation.
Stereo ping-pong delay?: Not in this release — the current implementation uses a single mono delay line applied to each channel. Ping-pong is on the roadmap.