# Audio Mixer Mix two audio files together with customizable timing control > Canonical page: https://elysiatools.com/en/tools/audio-mixer - **Category:** Media - **Keywords:** audio, mixer, combine, overlay, blend, timing, duet ## Overview Audio Mixer combines two audio files into one track with a customizable start time for the second file. Upload two supported audio files, choose when the second track begins, and export the mix as MP3, WAV, FLAC, AAC, OGG, or M4A. ## Inputs - **Audio Files** (file): Select 2 audio files to mix... - **Second Track Start Time (seconds)** (text): Enter when the second audio should start. 0 = start immediately, 5 = after 5 seconds, 1:30 = after 1 minute 30 seconds - **Output Format** (select) ## When to use - Overlay a voice recording with music or another audio track. - Create a simple duet by starting the second recording at a chosen time. - Combine two compatible audio files into a single downloadable file. ## How it works - Upload exactly two audio files in a supported format, such as MP3, WAV, FLAC, AAC, OGG, MP4, or M4A. - Enter the second track's start time in seconds or in minute-and-second format, such as 5 or 0:30. - Choose an output format: MP3, WAV, FLAC, AAC, OGG, or M4A. - Run the mixer to create one combined audio file. ## Use cases - Add background music beneath a spoken introduction. - Combine two vocal recordings for a duet or layered performance. - Place a sound effect or second recording at a specific point in an audio track. ## Frequently asked questions ### How many audio files can I mix? The tool mixes exactly two audio files. ### Which audio formats can I upload? Supported inputs include MP3, WAV, FLAC, AAC, ADTS, OGG, MP4, and M4A. ### When does the second audio track start? It starts at the time you enter. Use 0 for immediate playback, 5 for five seconds, or 0:30 for one minute and 30 seconds. ### Which output formats are available? You can export the mixed file as MP3, WAV, FLAC, AAC, OGG, or M4A. ### Can I mix a voice recording with music? Yes. Upload the voice recording and music file, then set the second track's start time. ## Related tools - [Audio Splicer](https://elysiatools.com/en/tools/audio-splicer): Splice multiple audio files into one single audio file with customizable output format - [Batch Audio Converter](https://elysiatools.com/en/tools/audio-batch-converter): Convert multiple audio files between different formats like MP3, WAV, FLAC, AAC, OGG, Opus with quality settings and batch processing - [Audio Format Converter](https://elysiatools.com/en/tools/audio-converter): Convert audio files between different formats like MP3, WAV, FLAC, AAC, OGG with quality settings and volume adjustment - [Audio Cutter](https://elysiatools.com/en/tools/audio-cutter): Cut and extract audio clips from audio files with precise time selection - [Audio Speed Changer](https://elysiatools.com/en/tools/audio-speed-changer): Change audio playback speed while maintaining original pitch using time-stretching algorithms - [FFmpeg Audio Noise Reduction](https://elysiatools.com/en/tools/ffmpeg-audio-noise-reduction): Professional audio noise reduction using FFmpeg advanced filters (highpass, afftdn, loudnorm) for optimal audio cleaning - [Audio Declicker](https://elysiatools.com/en/tools/audio-declick): Remove clicks and pops from audio files caused by vinyl records, digital errors, or other impulsive noise sources - [Audio Decrackler](https://elysiatools.com/en/tools/audio-decrackle): Remove crackles and subtle impulsive noise from audio files. Ideal for restoring old recordings, cassette tapes, and digitized vinyl with surface noise ## Samples - [Copyright-Free M4A Audio Samples](https://elysiatools.com/en/samples/m4a-samples): Apple iTunes compatible M4A audio samples with AAC encoding, optimized for quality and file size balance - [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 ## Related content - [Karaoke, Stem Separation & Vocal Tools](https://elysiatools.com/en/hubs/karaoke-and-stem-separation-tools): Remove vocals for karaoke tracks, split songs into stems, isolate or double vocals, slice beats, and balance your mix with free browser-based audio tools. - [Audio Encoding and Format Conversion Tools](https://elysiatools.com/en/hubs/audio-convert): Compare audio format conversion, bitrate changes, sample-rate conversion, codec swaps, and export tools in one hub for delivery and archive workflows. - [Audio Editing and Cleanup Tools](https://elysiatools.com/en/hubs/audio-utility): Compare audio trimming, silence removal, fades, mixing, and denoise tools in one hub for podcast, voiceover, and music cleanup workflows. - [Audio Preview, Tone, and Effect Generator Tools](https://elysiatools.com/en/hubs/audio-generate): Compare audio preview generation, silence creation, ringtone building, fingerprinting, loudness reports, and effect-style audio generators in one hub.