Grace or Graphical Realtime Algorithmic Composition Environment is a cross-platform GUI application specially designed for algorithmic music composition with CM3.
It is implemented in JUCE (C++) and contains the Scheme interpreter built into it. The Grace code editor supports both SAL and Scheme languages with evaluation, syntax highlighting (code coloring), help lookup for defined symbols and many Emacs cursor motion commands.







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The Grace Crack editor is designed for realtime algorithmic music composition with Scheme and CM3.
Main Features:
* a graphical realtime environment
* cross-platform GUI
* evaluative programming for Scheme
* visual feedback on the sound board
* embedded Scheme interpreter
* built-in help support for scheme
* visual editor with many programming modes
* editing mode, geometry mode, and others
* integrated Scheme debugger with memory, instruction trace, live status and more
* built-in MIDI editor with note on/off, recording and editing
* preview window and built-in MIDI synthesizer (ChordEvent library)
* MIDI file export and import
* realtime CV output with audio-based modes
* built-in MIDI time-stretching with alpha parameters and key/rate control
* round robin tempo-synchronized steps
* DLS sampling with key/rate control
* MIDI-sendable MIDI clock sync from computer’s CPU
* MIDI-sendable MIDI clock sync from audio-output devices like synths and samplers
* native code debugger for Windows and MacOS
* native code debugger for iOS and Android
* self-made GUI library and GUI creation engine
* C++ GUI/game library for embedded C++
* OpenGL-based GUI/game library for Windows, MacOS and Linux
* native-to-c++ interop with C++ libraries
* GUI-creation engine with dynamic GUI porting
* GUI porting to Android and iOS
* multi-voice realtime MIDI sequencing, multi-track MIDI recording and editing
* chord event library
* software synthesizer library for both FM and AM
* software instrument library for both FM and AM
* fully multithreaded and multiscreenal apps
* built-in MIDI sequencer
* cross-platform audio thread for low-latency audio
* built-in GUI control library
* beat grid and MIDI events for more human-friendly music
* MIDI events can trigger audio events and play samples
* MIDI events can be routed to play other instruments
* fully customizable interface and user mode
* samples can be loaded from external source
* scopes can be configured to access only selected regions of the score or to modify register values
* built-in MIDI sequencer
* automated GUI layout for quick GUI generation
* automatic GUI layout and auto-fit to screen
* structured and name-based GUI layout
* inline

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kMacro is a script editor for macOS, which includes a powerful macro system and a Python 3 package manager. The project is called Keymacro, because the main logic of the application is implemented in a Python script named “”, which is loaded and evaluated when the script is launched. Keymacro can be launched from the scripts tab of the menu bar or from any Finder window or via the command line. The Keymacro command allows one to write and run Lisp-like macros in Python using the editor’s own Python grammar. The bundled package manager allows to install and uninstall scripts from the Keymacro configuration tab. This tab includes many useful options for starting new scripts, and also the ability to save scripts with a different name and load it later. Additionally, the configuration tab allows the user to define Macros with text and code snippets, and to select them while starting new scripts. When macros are used in the code, they are written in a dark font so that they can be easily identified by the script’s author.
The Keymacro configuration tab contains the “macro.yml” file, which defines the contents of the Macros with list of packages, snippets and function declarations.
The file macro.yml in the macropackages/ contains a list of packages, snippets and functions. Each line in the list defines one macro, which can be used as a package or snippet.
All macros are saved with an extended name in the macro.yml configuration file. This allows the user to save macros by different names and later find them using the keyword “macro.yml” in the application’s help.
The Macros are searched using the aforementioned Python grammar, which is included in the Keymacro package. This way, even if it happens that the user has not saved a macro with a specific name, it will still find it, even if its name changes.
In addition to the text snippets, the package manager also contains functions and other snippets, which can be saved in the same manner.
All the provided functions are used to print a string to the screen or to file. The official and latest version of these functions can be found in the internal Macros repository.
All the functions are stored inside of a sub-package called “functions”.
The packages can be installed with the “” script. The script is used to copy a package to the current folder, execute the package and then to update the package information in

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Grace allows algorithmic music composition using CM3 with any MIDI device on Linux, Mac OS X or Windows. It is a cross-platform app, suitable for both beginner and experienced composers.

Grace allows you to write your own musical algorithms in Scheme or Python with a drag and drop interface for programming CM3. Grace can be used as a composer or as a MIDI sequencer to help write your musical ideas.
Grace supports all CM3 features: monophonic instruments, polyphony, note on/off, note velocity, portamento, vibrato, chorus, pitch bend, special effects, performance view, undo/redo, undo/redo with both voices or entire pattern, musical templates, etc.

Grace has a graphical drag-and-drop interface with any MIDI device and is a powerful compositional tool. It can be used to compose any type of music, from an introductory tutorial to a five-minute piano piece.

Grace is also a MIDI sequencer which allows you to write musical ideas, and to listen, modify, transpose, print and export sequences from Grace. You can edit chords, scales, modes and more, allowing you to create a score that fits your personal tastes.

Grace can be used to compose any type of music, from a tutorial to a five-minute piano piece. It has a graphical drag-and-drop interface and a full MIDI sequencer to help you write ideas. You can use Grace’s integrated editor to compose your ideas, choose a performance template, or simply play notes.

Grace is compatible with CM3 and was originally developed on Linux. It should also be compatible with current version of CM3 in Python or Scheme.

Grace is available from the website:

The current version of Grace is the 4th. It was released in October 2011. It will be fully compatible with CM3 2.0 in Scheme.

The previous versions of Grace

Grace 1.0
Grace 1.0 was released in 2009. It was made with Python.

The current version of Grace is the 3rd. It was released in June 2010. It was made with a Scheme-based GUI.

Grace 0.9.0
Grace 0.9.0 was released in 2009. It was made with Python.

The previous version of Grace was the 2nd, and it was released in 2007.

What’s New In Grace?

This article describes the GUI of Grace or Graphical Realtime Algorithmic Composition Environment.

Grace is available for both Windows and Linux systems. To use the program, you first need to install JUCE and Scheme interpreter which are both free to download and install. JUCE can be downloaded from and Scheme interpreter from

After installing the components, you can start the application by double-clicking on the Grace icon.

You can then start a project by clicking on the open button on the main window. Grace allows a composer to create and save project files. Each project file includes a set of commands which define a track and a sequence of operations.

Each track is defined by a section which has one or more components. Each component can be selected by clicking on it or drag and drop components by clicking and dragging the track border. A grid will automatically be created for components that are not yet selected.

The sequence of operations is defined by a section which is similar to a playhead position. Each section has one or more loops which are defined by incrementing the track time.

The graphical composition environment provides a live evaluation of the algorithms as they are sequenced and played. You can evaluate the values of variables at any point in time during the composition and keep the values in a text file or a database.

You can also use the Grace help feature to find out the definition of a symbol.



The following project file has been created for our example.

Project File: realtime_algorithmic_composition.grace

Main Grid is: (note that row is not mandatory)

The “GRID”


1. “Project File:”

2. “Main Grid”

3. “INDEX”

4. “H”

5. “START”

6. “TIME”

7. “MODE”


9. “LOOP”


11. “SYSTEM”

12. “SERVER”

13. “SET”

14. “GET”



15. “GRID”

“SIZE” 16. “BELL”


18. “LINE”

19. “COLOR” “Background” “NODE” “CONTENT” “BORDER” “CO

System Requirements:

-Requires a GeForce GTX 1080/1070 or AMD RX Vega 56 graphics card, or equivalent.-Requires a 4K (3840 x 2160) display with support for 60 Hz refresh rate (e.g., 1440p monitors are not supported)-AMD FreeSync (a desktop monitor must have a native AMD FreeSync compatible output in order to be supported).-Requires Windows 10 version 1903 (19H1).-Please note that, currently, Radeon FreeSync 2 is not supported and AMD recommends that users use a monitor that supports the highest available refresh rate.-Users may need to

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