Reactional Composer Beta

Reactional Composer

Reactional Composer is the future of game music. Design elastic soundtracks, adapt every note in real time, and export straight to Unity, Unreal, and beyond.

Download composer Watch overview

VST3 support Elastic tempo & key Engine-ready export

Drag & drop workflow

Auto convert your DAW session.

Musical design

Add unprecedented musical interactivity.

Per instrument, per note. Tempo, scales, chords, rhythms.

Export directly to game

Test your interactive music immediately.

Super simple game API.

Note

Design on a note-by-note level

Reactional is a procedural playback system for interactive music. Every note in your composition can be addressed individually so your soundtrack reacts to gameplay with nuance you can't achieve in linear stems.

Use your preferred DAW, bring your own VST3 instruments, and export to any engine or platform.

Plugins

Hyper-interactive controls for musical storytelling

Dial into your score with controls that update in real time. Each glass tile reflects a parameter you can automate inside Reactional.

speed Scale tempo

music_note Change key

shuffle Change chords

tune Instrumentation

waves Pitch deviation

blur_circular Change rhythms

volume_up Scale dynamics

graphic_eq Change timbre

swap_horiz Change form

texture Change texture

library_music Switch harmony

edit Affect melody

compare_arrows Modal transpose

trending_flat Chromatic transpose

equalizer Low-pass filter

volume_up Volume

surround_sound Panning

open_with Stretch ranges

sync Swing

grid_on Force quantize

shuffle_on Note probability

Intelligent stingers.

Compose a stinger or a leitmotif once in a single chord or key.

Reactional automatically adapts every hit to whatever harmony your game calls for.

Malleable.

Played back live, the music stays fluid and overrideable.

Map cues to player actions and let them actually perform these instruments.

Music that actually adapts.

Keep every layer in tune and in time with any licensed or uploaded track.

Catalog metadata makes your interactive themes sync with external music.

Tutorials

Interactive music in 2 minutes

Go from DAW to game faster than brewing a cup of coffee.

Composing procedural music

Tutorial: Learn how to score for Reactional playback.

Designing musical interactivity

Tutorial: Master the basics of Reactional Composer.

Get Composer

Binaries for Windows, macOS, and Linux are available on the Reactional Platform.

Download here

FAQ

Frequently asked questions

How much does it cost? +

Composer is free to use. Game teams need a Reactional license to ship interactive themes.

Can I use my own VSTs? +

Yes, VST3 plugins are supported. Most work well, and rendered audio is packaged into an encrypted file specific to the composition.

Which DAW can I import from? +

Ableton Live & Reaper natively; Cubase 14, Studio One & Bitwig via DAWProject export. More DAWs are on the way.

Does the system generate callbacks for game engines? +

Yes. Every event in the interactive theme—note on/off, chord, tempo changes—can trigger callbacks inside your engine.

How do you adapt to commercial music? +

Reactional's analysis pipeline adds rich metadata to licensed tracks so your interactive compositions stay locked to their key and tempo.

Does it work with audio tracks or loops? +

Composer focuses on MIDI today. You can import audio, but it will fix the theme to that key and tempo. You can still sync interactive themes with audio via the platform.

Can I sell my interactive themes? +

Soon you’ll be able to sell themes on the Reactional marketplace or distribute them independently.