> ## Documentation Index
> Fetch the complete documentation index at: https://comfytv.org/llms.txt
> Use this file to discover all available pages before exploring further.
# Click Track
> Generate a metronome click as audio — set a tempo and meter, or build the click from labels.
## What this node does
**Click Track** produces a metronome. Give it a tempo, a time signature and a
number of bars, and it renders a click audio track (accented downbeat, plain
off-beats) through the same SoundFont synthesizer the rest of the music lane
uses. Optionally, wire in a `labels` text input to place the clicks at specific
labelled points instead of on a fixed grid.
Press **▶ Run** to render on the backend. The node emits two outputs: the
`audio` click track, and a `performance` payload describing the clicks — the
same kind of performance **Score Synth** and other stages consume, so the click
can double as a timing reference for other renders.
## When to use it
* You need a metronome track to record or align against.
* You want a count-in or timing bed at a specific BPM and meter.
* You have timing labels and want clicks placed at exactly those points.
## Parameters
### bpm
Tempo in beats per minute, **20–400** (default **120**), in 0.5 steps. Ignored
when a `labels` input drives the clicks instead.
### beats\_per\_bar
Beats per bar (the top of the time signature), **1–12** (default **4**). The
first beat of each bar is accented.
### bars
How many bars to generate, **1–256** (default **8**).
### soundfont
Optional SoundFont file name from the resource library used to voice the click.
If blank (or not found), the synth's built-in click voices are used.
### labels (optional input)
An optional text input, type `COMFYTV_TEXT`. When present, the click track is
built from these labels (clicks land at the labelled positions) instead of from
`bpm`/`beats_per_bar`/`bars`.
## Outputs
| Output | Type | Meaning |
| --------------- | --------------- | ------------------------------------------------------------ |
| **audio** | `COMFYTV_AUDIO` | The rendered metronome click track |
| **performance** | `COMFYTV_TEXT` | The click performance (JSON), reusable as a timing reference |
## Tips
* Leave `labels` unwired for a plain grid click; wire it when you need clicks at
irregular, labelled points.
* The `performance` output can be fed to **Score Synth** or used to line up
other stages to the same grid.
* Add a SoundFont only if you want a specific click sound; the default works
out of the box.
## Related nodes
* **Score Synth** — can render the click `performance`, and shares its synth.
* **Score Performer** — produces musical performances the same way.
* **Bridge** — convert `COMFYTV_AUDIO` to/from native ComfyUI audio. See
[https://github.com/jtydhr88/ComfyTV/blob/main/docs/bridges.md](https://github.com/jtydhr88/ComfyTV/blob/main/docs/bridges.md)