How to use the notation plugin

This plugin currently allows you to type in simple examples via abc notation. We don't have a full help page in English yet. You can either

see the OMA help on abc in German and use you browser's translate function
or go to https://abcnotation.com/learn for an introduction and examples in English.

Here's an example of what it can look like:

Alternative: musicXML

It is also possible to write sheet music with notation software and export a musicXML file. This you can then import to OMA using the plugin MusicXML viewer.
Or you export your notation as an image (.svg or .png are recommended) and use OMA's image plugin.