> For the complete documentation index, see [llms.txt](https://docs.lmms.io/user-manual/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.lmms.io/user-manual/jian-ti-zhong-wen/xiao-guo-qi-cha-jian/flanger-xiang-bian-qi.md).

# Flanger（镶边器）

<figure><img src="https://3710990805-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FZRacsG2wvxpXwri0XH6G%2Fuploads%2FYgqZ1XqrZmUVblNGa8Zo%2Fimage.png?alt=media&amp;token=9d5b76c8-9560-47b0-aa9e-c3d37ec0a346" alt=""><figcaption><p>Flanger</p></figcaption></figure>

A [Comb Filter](https://en.wikipedia.org/wiki/Comb_filter) modulated with a LFO.

## Knobs

* **DELAY:** adjusts comb filter [delay](https://en.wikipedia.org/wiki/Delay_\(audio_effect\)).&#x20;
* **AMOUNT:** adjusts LFO amplitude.&#x20;
* **RATE:** adjusts LFO frequency.&#x20;
* **FEEDBACK;** adjusts comb filter [feedback](https://en.wikipedia.org/wiki/Feedback).
* **NOISE:** adjusts amount of white noise mixed into input signal.

{% hint style="info" %}
The LFO modulates comb filter delay, this LFO takes the form of a [sine wave](https://en.wikipedia.org/wiki/Sine_wave#/media/File:Waveforms.svg).
{% endhint %}

## Buttons

* **Invert:** currently does nothing (safe to ignore).