# Audio Stem Mixer

Mix multiple stems and export vocal up/down versions

> Canonical page: https://elysiatools.com/en/tools/audio-stem-mixer

- **Category:** Media

- **Keywords:** audio, stem, mix, vocal up, vocal down, batch

## Overview

Creates three mixes (normal, vocal up, vocal down) and packages them in a zip.

## Inputs

- **Stem Files (2-8)** (file): Select stem audio files
- **Vocal Stem Index (0-based)** (number): 0
- **Vocal Up Gain (dB)** (number): 3
- **Vocal Down Gain (dB)** (number): -3
- **Output Format** (select)

## When to use

- When you have separate audio stems from a recording and need to mix them into cohesive tracks.
- When you want to adjust vocal levels by boosting or reducing them for different listening contexts.
- When you need to export audio mixes in various formats like MP3, WAV, or AAC efficiently.

## How it works

- Upload 2 to 8 audio stem files in supported formats.
- Specify the vocal stem index and set gain levels for vocal up and down versions.
- Select the output format and process to generate three mixes in a zip file.

## Use cases

- Creating alternate mixes in music production with emphasized or de-emphasized vocals.
- Balancing vocal levels in podcast episodes that have multiple audio tracks.
- Adjusting dialogue stems in audio post-production for film or video projects.

## Frequently asked questions

### What audio formats can I upload as stems?

You can upload common audio formats such as MP3, WAV, AAC, and others as stem files.

### How many stems can I mix at once?

The tool supports mixing between 2 and 8 audio stems simultaneously.

### What is the vocal stem index?

It is a 0-based index that identifies which stem file contains the vocals for gain adjustment.

### Can I customize the gain for vocal versions?

Yes, you can set vocal up gain (default +3 dB) and vocal down gain (default -3 dB) within a range of -12 to 12 dB.

### What output formats are available?

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

## Related tools

- [Audio Dialog Isolation](https://elysiatools.com/en/tools/audio-dialog-isolation): Isolate vocals and accompaniment using a neural network (HT-Demucs FT, ONNX)
- [Bleed Reduction](https://elysiatools.com/en/tools/bleed-reduction): Reduce bleed between multiple audio stems and package the results
- [Batch Audio Rename](https://elysiatools.com/en/tools/audio-batch-rename): Batch rename audio files using patterns, text replacement, numbering, and case conversion. Returns renamed files as a ZIP download.
- [Audio Crossfade Batch](https://elysiatools.com/en/tools/audio-crossfade-batch): Batch concatenate audio files with automatic crossfades
- [Audio Key Change for Singers](https://elysiatools.com/en/tools/audio-key-change-for-singers): Transpose a song by key or semitones while preserving its duration and speed.
- [Audio Kick-Bass Phase Aligner](https://elysiatools.com/en/tools/audio-kick-bass-phase-aligner): Compare kick and bass timing/phase in the low band, report the offset and polarity, and export the corrected track with sample-accurate alignment.
- [Audio Mix](https://elysiatools.com/en/tools/audio-mix): Mix multiple audio tracks together with adjustable volumes
- [Audio Mixer](https://elysiatools.com/en/tools/audio-mixer): Mix two audio files together with customizable timing control

## 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

- [Karaoke and Stem Separation Tools](https://elysiatools.com/en/hubs/karaoke-and-stem-separation-tools): Separate vocals and accompaniment, clean the resulting stems, set a controlled balance, and prepare a karaoke or remix-ready delivery.