Capítulo 4. Extending GNU Solfege
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## Capítulo 4. Extending GNU Solfege

## Introduction

GNU Solfege is written so that it can easily be extended, even if you do not know any computer programming. The steps are:

- Create a lesson file.

- Create a learning tree for your own lesson file. You do this only once.

- Add the lesson file to the learning tree.

Read “Lesson files” for details on creating lesson files. The easiest way to get started is to take one of the existing lesson files, and modify it. The lesson files included in Solfege are stored in a directory names `lesson-files`. The exact location of this directory depends on your operating system and show you have installed the program. A few suggestions are `C:\Program files\GNU Solfege`, `/usr/share/solfege`, `/usr/local/share/solfege` or `~/.local/share/solfege`.

You create a learning tree by opening the learning tree editor. Select Learning tree from the Edit menu. Then click the New button and enter a file name. The file will be stored in a directory named `.solfege/learningtrees` in your home directory.

Then you create a menu and a submenu with the learning tree editor, and finally adds the lesson file to the selected submenu by clicking the Add lesson button.

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Inverting intervals | Principal | Lesson files