> ## 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.

# Pulse mode: phones that change colour on the music's beat

> Upload a playlist to Pulse mode. Luce finds each song's beat, and while a song plays, every phone changes colour on the beat as the song gets louder.

Pulse plays your music and lights the phones to it. Luce finds the beat of each song you upload, and while a song plays from the console, every phone changes colour on the beat, moving up the song's colours as it gets louder.

![Pulse mode with the song playing, its loudness timeline, a playlist of four songs and the song's four colours](https://docs.luce.show/docs/images/modes/pulse-light.png)

## Add songs

Choose **Add songs** and pick audio files: mp3, m4a or wav, up to 25 MB each and 30 songs in all. Luce reads each file and finds its beat, then shows the song's length and tempo in BPM. A song without a steady beat is marked "Couldn't find a steady beat".

Choose **Edit Playlist** to rename or reorder the songs.

## Give each song its colours

Each song has between 2 and 12 colours, quietest first. Above each colour you see how much of the song it is on. Choose **Edit Colors** to change them, or **From library** to use colours you saved.

**Hold at least** sets how long a colour stays before the song's loudness can move it again: 1, 2, 4 or 8 beats.

## Play the playlist

Use **Play**, **Pause**, **Previous song** and **Next song** in the console. They work whether or not Pulse is on air, so you can find your place before the show. The phones follow the music only while Pulse is [on air](https://docs.luce.show/modes/overview.md#put-a-mode-on-air), and stay dark while nothing plays.

> [!TIP]
>
> Play the music through the venue's sound system from the device running the console, so the room hears the same song the phones follow.


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