# Customize note instance in runtime

### Overview

You can link up your own method to do a custom logic when a note is being initialized.

![](https://32629026-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-M76iL7-CNlRUwW2lAqS%2F-Mi-S7Abxq_Tg9iEM6QM%2F-Mi-WqPaM5QR4-boZK2X%2Fimage.png?alt=media\&token=ac3ddf40-ed6b-446c-adb1-8c05bef19571)

Examples from the Colorful Demo, check out the Colorful Notes Handler, which linked up with multiple event callbacks from RhythmCore.

![](https://32629026-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-M76iL7-CNlRUwW2lAqS%2F-Mi-S7Abxq_Tg9iEM6QM%2F-Mi-XJitxPM4RRkKbtL9%2Fimage.png?alt=media\&token=8b11de6c-d133-4dd8-8ac6-66780eb81b84)

Example code to set the note to a random color on init.

{% code title="ColorfulNotesHandler.cs OnNoteInit method" %}

```csharp
//For receiving call back from the TrackManager's (onNoteInit) event, when a note is being init
public void OnNoteInit(Note note)
{
    var selectedColor = randomColors[Random.Range(0, randomColors.Count)];
    //Loop through all the notes, then assign a random color to them
    foreach (var renderer in note.GetComponentsInChildren<SpriteRenderer>())
    {
        if (renderer.name != "Swipe Indicator")
            renderer.color = selectedColor.color;
    }
    //We appends the color name to the the note object, so we can recognize it back later on
    note.name = selectedColor.name;
}
```

{% endcode %}


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