# Audio Channel Mapper

Remap audio channels to different outputs

> Canonical page: https://elysiatools.com/en/tools/audio-channel-mapper

- **Category:** Media

- **Keywords:** audio, channel map, remap, pan, surround, stereo, routing

## Overview

Flexible channel remapper using FFmpeg pan. Choose an output layout (stereo, quad, 5.1) and provide a pan expression (e.g., c0=FR|c1=FL to swap stereo). Useful for correcting routing, creating stems, or custom speaker layouts.

## Inputs

- **Audio File** (file): Select an audio file
- **Output Layout** (select)
- **Pan Expression** (textarea): Example: c0=FR|c1=FL (swap stereo) or c0=FL|c1=FR|c2=FC|c3=LFE|c4=SL|c5=SR
- **Output Format** (select)

## When to use

- When correcting audio channel routing errors in recordings or mixes.
- When creating individual audio stems for mixing or post-production.
- When designing custom speaker layouts for surround sound systems.

## How it works

- Upload an audio file in a supported format (e.g., MP3, WAV).
- Select the desired output layout from options like mono, stereo, quad, or 5.1.
- Enter a pan expression to define how input channels map to output channels (e.g., c0=FR|c1=FL to swap stereo).
- Choose an output format and process the file to generate the remapped audio.

## Use cases

- Correcting left-right channel swaps in podcast or interview recordings.
- Extracting individual instrument stems from a multi-channel audio mix.
- Creating custom surround sound configurations for home theater systems.

## Frequently asked questions

### What audio file formats can I upload?

You can upload any audio format supported by FFmpeg, such as MP3, WAV, AAC, or FLAC.

### How do I write a pan expression?

Pan expressions use FFmpeg syntax, like 'c0=FL|c1=FR' to map channel 0 to front left and channel 1 to front right. Refer to FFmpeg pan documentation for advanced options.

### Can I remap to surround sound formats like 5.1?

Yes, select the 5.1 output layout and define a pan expression for multi-channel mapping.

### Is there a limit on audio file size?

Yes, the audio file must be under 200 MB.

### What is the default pan expression?

The default is 'c0=FL|c1=FR', which maps the first two channels to stereo left and right.

## Related tools

- [Audio Channel Mixer](https://elysiatools.com/en/tools/audio-channel-mix): Mix left and right channels into mono with specific ratios
- [Extract Left Channel](https://elysiatools.com/en/tools/audio-left-channel-extract): Extract only the left channel to a mono file
- [Mid/Side Encode](https://elysiatools.com/en/tools/audio-mid-side-encode): Encode a stereo file into Mid/Side channels
- [Audio Pan](https://elysiatools.com/en/tools/audio-pan): Pan the audio from left to right or vice-versa
- [Extract Right Channel](https://elysiatools.com/en/tools/audio-right-channel-extract): Extract only the right channel to a mono file
- [Surround to Stereo](https://elysiatools.com/en/tools/audio-surround-to-stereo): Downmix a surround sound file (e.g., 5.1) to stereo
- [DTS to AC3 Converter](https://elysiatools.com/en/tools/dts-to-ac3): Convert DTS audio to AC3 (Dolby Digital) format with bitrate and channel controls
- [Mono to Stereo Converter](https://elysiatools.com/en/tools/mono-to-stereo): Convert a mono audio file to stereo (by duplicating channel)

## Samples

- [Copyright-Free FLAC Audio Samples](https://elysiatools.com/en/samples/flac-samples): Lossless FLAC audio samples for testing and development, mirrored from MP3 set with nature sounds and meditation music
- [Copyright-Free MP3 Audio Samples](https://elysiatools.com/en/samples/mp3-samples): Collection of royalty-free audio samples for testing and development purposes including nature sounds, meditation music, and ambient audio
- [Copyright-Free WAV Audio Samples](https://elysiatools.com/en/samples/wav-samples): Uncompressed PCM WAV audio samples for testing and development, mirrored from MP3 set with nature sounds and meditation music
- [Copyright-Free Raw PCM Audio Samples](https://elysiatools.com/en/samples/pcm-samples): Raw PCM s16le audio samples featuring nature ambience and relaxing music for waveform, playback, and conversion workflows

## Related content

- [Audio Channel Routing and Delivery Verification](https://elysiatools.com/en/hubs/audio-channel-routing): Route, split, join, and convert mono or stereo audio while preserving left/right intent and checking the final file before delivery.