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Audio Sequence Builder

Build an audio sequence from clips placed at specified start times (can overlap)

Sequence configuration

  • Upload audio clips in the desired order

  • Provide a start time (in seconds) for each clip

  • Clips can overlap, creating a mixed output

  • Useful for creating podcasts, soundscapes, or timing adjustments

    Example:

  • File 1: Background music (starts at 0s)

  • File 2: Voiceover intro (starts at 5.5s)

  • File 3: Sound effect (starts at 12s)

    Input:

  • Audio Files: [music.mp3, voice.wav, sfx.wav]

  • Start Times: 0, 5.5, 12

Click to upload files or drag and drop files here

Maximum file size: 200MB Maximum files: 20
Supported formats: audio/*

Key Facts

Category
Media
Input Types
file, text, select
Output Type
file
Sample Coverage
4
API Ready
Yes

Overview

The Audio Sequence Builder lets you arrange multiple audio clips on a timeline by specifying their start times in seconds. Clips can overlap, enabling seamless mixing for podcasts, soundscapes, or precise audio timing adjustments.

When to Use

  • •When you need to combine several audio files into a single sequence with specific start times.
  • •For creating layered audio mixes where clips overlap, such as background music with voiceovers.
  • •To adjust the timing of audio elements without editing the original files.

How It Works

  • •Upload your audio clips in the desired order.
  • •Enter the start time in seconds for each clip, separated by commas.
  • •Select the output format from options like MP3, WAV, or AAC.
  • •Generate the sequence to produce a mixed audio file based on the timings.

Use Cases

Producing podcast episodes with intro music, voice segments, and sound effects timed perfectly.
Creating audio backgrounds for videos by layering music and ambient sounds at specific timestamps.
Designing soundscapes for games or apps by timing various audio elements to create immersive experiences.

Examples

1. Podcast Intro with Layered Audio

Podcast Producer
Background
A podcast producer needs to create a 30-second intro that includes background music, a voiceover, and a sound effect, all starting at different times.
Problem
Manually syncing and mixing these clips in audio editing software is inefficient and prone to errors.
How to Use
Upload the music.mp3, voiceover.wav, and effect.wav files. Set start times to 0, 5, and 10 seconds respectively.
Outcome
A single MP3 file with music from 0s, voiceover starting at 5s, and sound effect at 10s, all mixed seamlessly.

2. Audio Sync for Video Soundtrack

Video Editor
Background
A video editor is working on a short film and needs to align dialogue, music, and sound effects to specific points in the video timeline.
Problem
Achieving precise audio timing to match visual cues requires careful alignment.
How to Use
Upload the dialogue.wav, music.mp3, and sfx.wav files. Enter start times based on the video, e.g., 0, 30, and 45 seconds.
Outcome
An audio sequence that syncs perfectly with the video, ready for integration into the final edit.

Try with Samples

audio, file
Copyright-Free AAC Audio Samples
High-quality AAC encoded audio samples for testing and development, featuring nature sounds and meditation music with excellent compression
title token audio
audio
Copyright-Free MP3 Audio Samples
Collection of royalty-free audio samples for testing and development purposes including nature sounds, meditation music, and ambient audio
title token audio
audio
Copyright-Free WAV Audio Samples
Uncompressed PCM WAV audio samples for testing and development, mirrored from MP3 set with nature sounds and meditation music
title token audio
audio
Copyright-Free OGG Vorbis Audio Samples
Open-source OGG Vorbis audio samples for testing and development, featuring excellent compression with nature sounds and meditation music
title token audio
audio

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FAQ

What audio formats can I upload?

The tool supports common audio formats such as MP3, WAV, AAC, and others as per the file input.

Can audio clips overlap in the output?

Yes, clips can overlap, and the tool will mix them accordingly in the final sequence.

How many audio clips are allowed per sequence?

You can upload up to 20 audio clips for a single sequence.

What output formats are available?

Available output formats include MP3, AAC, M4A, OGG, Opus, FLAC, and WAV.

Is there a file size limit for uploads?

Each audio file can be up to 200 MB in size.

API Documentation

Request Endpoint

POST /en/api/tools/audio-sequence-builder

Request Parameters

Parameter Name Type Required Description
audioFiles file (Upload required) Yes -
startTimes text Yes -
outputFormat select No -

File type parameters need to be uploaded first via POST /upload/audio-sequence-builder to get filePath, then pass filePath to the corresponding file field.

Response Format

{
  "filePath": "/public/processing/randomid.ext",
  "fileName": "output.ext",
  "contentType": "application/octet-stream",
  "size": 1024,
  "metadata": {
    "key": "value"
  },
  "error": "Error message (optional)",
  "message": "Notification message (optional)"
}
File: File

AI MCP Documentation

Add this tool to your MCP server configuration: 

{
  "mcpServers": {
    "elysiatools-audio-sequence-builder": {
      "name": "audio-sequence-builder",
      "description": "Build an audio sequence from clips placed at specified start times (can overlap)",
      "baseUrl": "https://elysiatools.com/mcp/sse?toolId=audio-sequence-builder",
      "command": "",
      "args": [],
      "env": {},
      "isActive": true,
      "type": "sse"
    }
  }
}

You can chain multiple tools, e.g.: `https://elysiatools.com/mcp/sse?toolId=png-to-webp,jpg-to-webp,gif-to-webp`, max 20 tools.

Supports URL file links or Base64 encoding for file parameters.

If you encounter any issues, please contact us at [email protected]