> ## Documentation Index
> Fetch the complete documentation index at: https://docs.luce.show/llms.txt
> Use this file to discover all available pages before exploring further.

# Auto mode: a light show that plays itself

> Prepare a running order of colours and colour slides in Auto mode, and Luce plays it on every phone in order, with play, pause, loop and restart.

Auto plays a prepared program on every phone, step by step, without you touching anything during the show. Use it for a part of the night with a fixed rhythm, or to keep the phones lit while you run something else.

<video autoPlay muted loop playsInline src="https://media.luce.show/docs/v1/modes/auto-play-light.mp4" aria-label="Pressing Play in Auto mode: the marker moves along the program and the phone preview changes colour step by step" />

## Build the program

A program has up to 200 steps. Each step is one of:

* **Color**: one colour for a moment.
* **Gradient**: a slide from a start colour to an end colour.

Each step has a **Length** between 0.1 and 5 seconds. Choose **Add step** to add one, or **Edit Steps** to change, delete or reorder them. While editing, you can tick several steps and copy them to the end of the program.

![Auto mode with its timeline, the Play button and eighteen colour and gradient steps](https://docs.luce.show/docs/images/modes/auto-light.png)

## Play it

* **Play** and **Pause** run the program. They work even when Auto is not on air, so you can rehearse it.
* Tap a step to play the program from there.
* **Back to the start** goes to the first step.
* **Play it again at the end** loops the program.

The phones follow the program only while Auto is [on air](https://docs.luce.show/modes/overview.md#put-a-mode-on-air).


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