> For the complete documentation index, see [llms.txt](https://jjazzlab.gitbook.io/developer-guide/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://jjazzlab.gitbook.io/developer-guide/add-rhythm-engine.md). # Architecture ## Overview ![](https://3060620187-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MQN01fU1nGY7UmcJHSV%2Fuploads%2FsepsxZQoRsv89CnehIay%2FJJazzLabArchitecture.png?alt=media\&token=658948ca-3712-4ddb-a45b-e63ea4d98597) ## Main NetBeans modules ### Core modules [ChordLeadSheet](https://github.com/jjazzboss/JJazzLab/tree/master/core/ChordLeadSheet) Model classes for the chord leadsheet [Harmony](https://github.com/jjazzboss/JJazzLab/tree/master/core/Harmony) Classes such as [Note](https://github.com/jjazzboss/JJazzLab/blob/master/core/Harmony/src/main/java/org/jjazz/harmony/api/Note.java), [Degree](https://github.com/jjazzboss/JJazzLab/blob/master/core/Harmony/src/main/java/org/jjazz/harmony/api/Degree.java), [TimeSignature](https://github.com/jjazzboss/JJazzLab/blob/master/core/Harmony/src/main/java/org/jjazz/harmony/api/TimeSignature.java), [ChordSymbol](https://github.com/jjazzboss/JJazzLab/blob/master/core/Harmony/src/main/java/org/jjazz/harmony/api/ChordSymbol.java), [ChordType](https://github.com/jjazzboss/JJazzLab/blob/master/core/Harmony/src/main/java/org/jjazz/harmony/api/ChordType.java), [Scale](https://github.com/jjazzboss/JJazzLab/blob/master/core/Harmony/src/main/java/org/jjazz/harmony/api/Scale.java), etc. [Midi](https://github.com/jjazzboss/JJazzLab/tree/master/core/Midi) Various utility classes, including classes to manage drum maps [MidiMix](https://github.com/jjazzboss/JJazzLab/tree/master/core/MidiMix) Model classes for the MidiMix (saved as .mix file). Controls the configuration of the output synth (bank select/program change, volume, panoramic, etc.) for a given song [MusicControl](https://github.com/jjazzboss/JJazzLab/tree/master/core/MusicControl) Classes to control music playback (start, pause, etc.) [Rhythm](https://github.com/jjazzboss/JJazzLab/tree/master/core/Rhythm) Model classes for a rhythm (style). [RhythmDatabase](https://github.com/jjazzboss/JJazzLab/tree/master/core/RhythmDatabase) Manage the available rhythm instances on the system [RhythmMusicGeneration](https://github.com/jjazzboss/JJazzLab/tree/master/core/RhythmMusicGeneration) Utility classes for music generation [Song](https://github.com/jjazzboss/JJazzLab/tree/master/core/Song) Model classes for a song (saved as .sng file). A song mainly contains a ChordLeadSheet, a SongStructure and optional user phrases. [SongStructure](https://github.com/jjazzboss/JJazzLab/tree/master/core/SongStructure) Model classes for a SongStructure ### App modules [ActiveSong](https://github.com/jjazzboss/JJazzLab/tree/master/app/ActiveSong) Manages the active song (JJazzLab can open several songs in parallel, but only the active one is allowed to send Midi data). [CL\_Editor](https://github.com/jjazzboss/JJazzLab/tree/master/app/CL_Editor) The graphical editor for a [ChordLeadSheet](https://github.com/jjazzboss/JJazzLab/blob/master/core/ChordLeadSheet/src/main/java/org/jjazz/chordleadsheet/api/ChordLeadSheet.java) object. [MixConsole](https://github.com/jjazzboss/JJazzLab/tree/master/app/MixConsole) The graphical editor for a [MidiMix](https://github.com/jjazzboss/JJazzLab/blob/master/core/MidiMix/src/main/java/org/jjazz/midimix/api/MidiMix.java) object. [SongEditorManager](https://github.com/jjazzboss/JJazzLab/tree/master/app/SongEditorManager) The central place where all song editors are managed [SptEditor](https://github.com/jjazzboss/JJazzLab/tree/master/app/SptEditor) The graphical editor for a [SongPart](https://github.com/jjazzboss/JJazzLab/blob/master/core/SongStructure/src/main/java/org/jjazz/songstructure/api/SongPart.java). [SS\_Editor](https://github.com/jjazzboss/JJazzLab/tree/master/app/SS_Editor) The graphical editor for a [SongStructure](https://github.com/jjazzboss/JJazzLab/blob/master/core/SongStructure/src/main/java/org/jjazz/songstructure/api/SongStructure.java) object. ### Plugins modules [FluidSynthEmbeddedSynth ](https://github.com/jjazzboss/JJazzLab/tree/master/plugins/FluidSynthEmbeddedSynth)Manages the internal FluidSynth-based synth. [JJSwing ](https://github.com/jjazzboss/JJazzLab/tree/master/plugins/JJSwing)A rhythm music generation engine for practicing jazz standards with a natural feel [YamJJazz ](https://github.com/jjazzboss/JJazzLab/tree/master/plugins/YamJJazz)A rhythm music generation engine with 2 Yamaha style-based rhythm providers --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation by asking a question. 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