Audio Export

MidiEditor AI can render your MIDI files to audio using the built-in FluidSynth synthesizer and loaded SoundFonts. Export to WAV, FLAC, OGG Vorbis, or MP3 - no external tools required.

The MP3 encoder (LAME 3.100) is compiled directly into MidiEditor AI as a static library. There is no need to install or configure anything.

How to Export

There are three ways to start an audio export:

File → Export Audio… (or Ctrl+Shift+E) - exports the full MIDI file or a custom range.
Right-click selection → Export Selection as Audio… - exports only the currently selected notes.
Export Audio button in the FluidSynth settings panel.

Right-click context menu showing Export Selection as Audio option

Right-click on selected notes to export just the selection.

Export Dialog

The export dialog lets you configure exactly how your audio should be rendered.

Export Audio dialog showing format, quality, range, and reverb tail options

Setting	Description
Format	Choose the output format: WAV - Uncompressed PCM. Largest file, highest quality. Best for further processing. FLAC - Lossless compression. Same quality as WAV, ~60% smaller. OGG Vorbis - Lossy compression. Good quality at small file sizes. MP3 - Lossy compression via LAME 3.100. Universal compatibility.
Quality	Preset quality tiers: Draft - 22050 Hz, 16-bit (fast rendering, small files) CD - 44100 Hz, 16-bit (standard quality) Studio - 48000 Hz, 16-bit (professional) Hi-Res - 96000 Hz, 16-bit (audiophile)
Range	What part of the file to export: Full Song - the entire MIDI file Selection - only the currently selected notes (when using the context menu) Custom Measures - specify start and end measure numbers
Reverb Tail	When enabled, adds extra time at the end so reverb and sustain can fade out naturally instead of cutting off abruptly.
Estimated Size	Shows the approximate output file size based on the current settings.

Export Progress

After clicking Export and choosing a save location, MidiEditor AI renders the audio in the background. A progress dialog shows the current phase and percentage.

For MP3 exports, there are two phases:

Rendering WAV - FluidSynth synthesizes the MIDI to a temporary WAV file.
Encoding MP3 - LAME converts the WAV to MP3 at the selected quality.

You can click Cancel at any time during either phase. The temporary files are cleaned up automatically.

Export Completion

When the export finishes, a dialog appears with three options:

Button	Action
Open File	Opens the exported audio file in your default media player.
Open Folder	Opens the containing folder in Windows Explorer.
Close	Dismisses the dialog.

Exporting Guitar Pro Files

Guitar Pro files (.gp3, .gp4, .gp5, .gpx, .gp) can be exported to audio just like regular MIDI files. MidiEditor AI automatically saves the imported data to a temporary MIDI file for FluidSynth to render. This happens transparently - no extra steps needed.

SoundFont Requirement

Audio export uses the currently loaded SoundFonts to determine instrument sounds. Make sure at least one SoundFont is loaded before exporting. If no SoundFonts are available, the export will fail with an error message.

Tip: The exported audio will sound exactly like what you hear during playback with FluidSynth. If you want different instruments, reorder or swap SoundFonts before exporting. SoundFonts that are disabled (unchecked) are not used during export.

Format Details

Format	Type	File Size	Best For
WAV	Uncompressed PCM	Large (~10 MB/min at CD)	Further editing in a DAW, maximum quality
FLAC	Lossless	Medium (~6 MB/min at CD)	Archival, quality-conscious distribution
OGG	Lossy	Small (~1.5 MB/min)	Web, games, Linux ecosystem
MP3	Lossy (LAME VBR)	Small (~1.5 MB/min)	Universal sharing, broad player support

Keyboard Shortcut

Shortcut	Action
`Ctrl+Shift+E`	Open the Export Audio dialog (full file)

Tips

No sound in export? Make sure SoundFonts are loaded. The export uses the same SoundFont stack as playback.
Wrong instruments? Check your SoundFont priority order. The export renders exactly what you hear during playback.
Export is slow? Hi-Res quality (96 kHz) takes longer to render. Try CD quality (44.1 kHz) for faster exports.
MP3 for sharing: MP3 at CD quality is the best choice for sharing online or via messaging apps.
FLAC for archival: FLAC preserves full quality while being significantly smaller than WAV.
FFXIV SoundFont Mode: If you have FFXIV SoundFont Mode enabled, the export respects it - your bard arrangements will sound correct.

Exporting Stems - Mute & Solo

Since 1.5.3, audio export honours the same mute and solo state as live playback, on both the channel list and the track list. This lets you bounce stems - one instrument at a time - without re-arranging the file. The behaviour is format-agnostic: it works for WAV, FLAC, OGG and MP3 alike, because the mute / solo filtering happens before FluidSynth's encoder stage.

Goal	How
Export only one channel	In the Channels panel (right side), `Solo` the channel you want, then `Ctrl+Shift+E`. The MP3/WAV will contain only the soloed channel.
Export everything except a channel	Mute the channels you don’t want, then export. Muted channels are dropped from the render.
Export only one track	In the Tracks panel, mute every other track (or just mute the ones you want gone). Per-track mute state is now respected by the renderer, even when several tracks share a MIDI channel.
Export a quick drum stem	Mute everything except your drum tracks. In FFXIV SoundFont Mode each named percussion track (Bass Drum, Snare Drum, Timpani, Bongo, Cymbal - with optional `+N`/`-N` octave suffix) is routed to the matching FFXIV bard percussion preset automatically, so the stem matches what you hear during playback.

Behind the scenes the export writes a temporary MIDI file with muted tracks stripped to empty MTrk chunks and forwards the channel mute / solo bitmask to the FluidSynth render callback, which drops every channel-bound message for masked channels. Same behaviour applies to Export Selection….