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

# LTXVModalityGuidance - ComfyUI Built-in Node Documentation

> This node applies cross-modal (audio-video) guidance to an LTXV-AV model.

This node applies cross-modal (audio-video) guidance to an LTXV-AV model. During sampling, it runs one extra forward pass per step with the audio-to-video and video-to-audio cross-attention connections disabled, then pushes the result toward the coupled prediction. This strengthens audio-visual synchronization, such as lip-sync. The reference default for `modality_scale` is 3.0; setting it to 1.0 disables the extra pass.

## Inputs

| Parameter        | Description                                                                                                               | Data Type | Required | Range                       |
| ---------------- | ------------------------------------------------------------------------------------------------------------------------- | --------- | -------- | --------------------------- |
| `model`          | The base model to which modality guidance will be applied. It is cloned internally, leaving the original model unchanged. | MODEL     | Yes      | -                           |
| `modality_scale` | Strength of the audio-video coupling guidance. Default is 3.0. Set to 1.0 to disable the extra forward pass.              | FLOAT     | Yes      | 1.0 to 100.0 (default: 3.0) |
| `start_percent`  | The point in the sampling process, as a percentage from 0.0 to 1.0, at which modality guidance begins. Default is 0.0.    | FLOAT     | Yes      | 0.0 to 1.0 (default: 0.0)   |
| `end_percent`    | The point in the sampling process, as a percentage from 0.0 to 1.0, at which modality guidance ends. Default is 1.0.      | FLOAT     | Yes      | 0.0 to 1.0 (default: 1.0)   |

Guidance is applied only for sampling steps whose sigma values fall within the range defined by `start_percent` and `end_percent`. Outside this range, the node returns the denoised result unchanged. A `modality_scale` of 1.0 also disables the extra forward pass entirely.

## Outputs

| Output Name | Description                                                                                                                 | Data Type |
| ----------- | --------------------------------------------------------------------------------------------------------------------------- | --------- |
| `model`     | The cloned model with a post-CFG guidance function attached. This modified model applies modality guidance during sampling. | MODEL     |

> This documentation was AI-generated. If you find any errors or have suggestions for improvement, please feel free to contribute! [Edit on GitHub](https://github.com/Comfy-Org/embedded-docs/blob/main/comfyui_embedded_docs/docs/LTXVModalityGuidance/en.md)

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