What is Echo Effect?

Echo Effect lets you record or upload audio and apply real-time echo and delay using the Web Audio API. Adjust delay time, feedback, and mix to go from a tight room slap to a long canyon echo.

The effect chain is a DelayNode plus a feedback gain loop, a damping low-pass inside that loop, and a wet/dry mix, built on the Web Audio API. Delay sets the time between repeats (50 to 1000 ms), feedback controls how many repeats you hear before the tail dies, damping rolls the highs off each repeat for a softer, room-like tail, and the mix slider blends dry signal with processed signal. Type your song's BPM to snap the delay to a quarter, eighth, or dotted-eighth note. One-click presets (Slapback, Vocal Room, Canyon, Stadium) set every control at once, and the result downloads as either 16-bit WAV or MP3.

How to use

1. Record audio using your microphone or upload an existing audio file (MP3, WAV, OGG, FLAC, AAC, or M4A).
2. Adjust the echo parameters — delay time (ms), feedback (how many repeats), dry/wet mix, and damping (how soft the tail gets). Type a BPM to snap the delay to a note value.
3. Preview the effect in real time, then download the processed audio file with the echo applied.

When to use

• Adding a slap-back echo to a podcast intro voice line for atmosphere.
• Roughing out a guitar delay sound before committing to a hardware pedal setting.
• Turning a flat dialogue clip into a phone-call or cave effect for a short film.

Result

A podcaster records a spooky intro, sets delay to 400ms with 60% feedback and a 50% wet mix, and lands an eerie cave echo for their horror episode.

FAQ

What's the difference between echo and reverb?

Echo is a discrete repeat of the original sound at fixed intervals, like a shout returning from a canyon wall. Reverb is many overlapping reflections that smear together. This tool produces echo. For reverb, look at the Reverb Effect tool instead.

How do I get a classic rockabilly slap-back?

Set delay to about 90 to 120 ms, feedback near 10%, and mix around 25%. That gives you a single bright bounce, the same trick Sun Studios used on early Elvis vocals. Push delay over 200 ms and it starts sounding rhythmic rather than slap.

Why does feedback above 80% sound like it's getting louder?

Each repeat is fed back into the delay line. Above about 75%, the new sound exceeds the loss from each pass and the line keeps building. We cap feedback below the runaway point, but the tail can still get long. Lower the value if the output clips.

What file formats can I upload?

MP3, WAV, OGG, FLAC, AAC, and M4A. Your device's audio decoder decides whether it can read the file; Safari only supports a subset of OGG. If a file fails, re-encode it to WAV at 44.1 kHz with a tool like Audacity.

Does the download include the dry signal?

Yes, the WAV is the post-mix output, so it carries both the original and the echo at whatever ratio your mix slider was on at export time. Pull the mix all the way to 100% if you want a wet-only stem to layer back in a DAW.

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