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 RapidComposer LE by MusicDevelopments is a Virtual Instrument Audio Plugin and an Audio Plugin Host. It functions as a VST Plugin. It can host VST Plugins.
RapidComposer LE
RapidComposer LE RapidComposer LE RapidComposer LE
Product RapidComposer LE
Developer MusicDevelopments
Price (MSRP)
Type / Tags Music PrototypingAlgorithmic Melody GeneratorChord GeneratorChord LibraryChord ProgressionsMusic ComposingMusic Prototyping
Plug-in, App & Soundware Format(s)
Can Host
Operating System Availability
Download Released
Downloads Released
System Requirements
•Supported operating systems: Windows Vista/7/8/10 (32-bit or 64-bit)
•Intel/AMD processor 1.4 GHz minimum
•512 MB RAM
Downloads Released
System Requirements
•macOS 10.7-10.14 (latest update)
•Intel Core Duo minimum
Supported Sample Formats (loads or saves) include
AIFF, SF2 (SoundFont), WAV
Miscellaneous Information
Copy ProtectionSerial Number

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 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.
  • 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 database of all MIDI, VSTi 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 (VSTi v2.4 plug-ins) support.
  • SoundFont (.SF2) support.
  • Standalone and VST version (32-bit and 64-bit).
  • Available for Windows and Mac OS X.
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