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RapidComposer LE

Music Prototyping Plugin by MusicDevelopments
Chord suggestions
Smart phrases Phrase generators Motive editor and generator Idea Tool Docked browsers Chord selection UI themes
RapidComposer LE by MusicDevelopments is a Virtual Instrument Audio Plugin and an Audio Plugin Host and a Software Application for macOS and Windows. It functions as an Audio Units Plugin, a VST 3 Plugin and a Standalone Application. It can host VST Plugins and VST 3 Plugins.
•Supported operating systems: Windows 8/10/11 (64-bit)
•Intel/AMD processor 1.4 GHz minimum
•512 MB RAM
•macOS 10.12-14 (latest update)
•Apple M1 or Intel Core Duo minimum
Can Host
Can Host
Sample Formats
Loads and/or Saves
AIFF, SF2 (SoundFont), WAV
Copy Protection
Serial Number
My KVR - Groups, Versions, & More
18 KVR members have added RapidComposer LE to 8 My KVR groups 23 times.
Not In Your MY KVR Groups
(or group limitation prevents versioning)
+8 in private groups

KVR Rank

Overall: 4943   3826   4686

30-Day: 4649; 7-Day: 5150; Yesterday: 1107

RapidComposer LE is a rapid music prototyping software designed for composers, song-writers and musicians of all musical styles.


  • Unique non-destructive, phrase-based music composition.
  • Advanced tools for phrase editing, phrase generation, phrase grouping, motif development, chord progression editing.
  • Chord suggestions, chord progression generation, chord progression rules editing.
  • Melody generation, melody harmonization.
  • Timeline with chords (absolute or chord functions) which all phrases automatically conform to.
  • Piano roll with scale notes, visually editable chord notes, and smart arranging of overlapped notes in two styles.
  • In-place non-destructive phrase-level and note-level editing.
  • Sophisticated MIDI CC editing and recording.
  • Articulations can be assigned to phrases or even individual notes.
  • Extensive scale, chord, guitar chord, chord progression databases.
  • Movable, resizable and transposable smart phrases that always conform to the current chord.
  • Phrase and rhythm generators help you to create thousands of musically useful (not random) phrases.
  • Taggable instrument library of all MIDI, VST/VST3 and SF2 presets in one place.
  • Variations can be applied to phrases, or whole tracks.
  • Intuitive drag and drop environment (you can drop chords, progressions, phrases, instruments to the composition).
  • Fully customizable user interface with preset themes.
  • Unlimited undo and the ability to make several versions of the same composition.
  • MIDI drag-and-drop tracks or composition to DAWs.
  • Virtual instruments and effects (VST/VST3 plug-ins) support.
  • SoundFont (.SF2) support.
  • Standalone and plug-in version (VST3 64-bit on Windows, AU and AU MFX on macOS).
  • Available for Windows and macOS (both Apple Silicon and Intel).

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