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.

Audio Delay / EchoLocal

inputaudio-delayoutputAdd 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.