# Expression and Script Library

**Search** with the bar at the top.

**Type filters:** **All**, **Expression**, **Script**.

**Source:** **Your Library** vs **Mute Library**.

## Applying expressions

* **Double-click** a preset to apply. Behavior follows **Settings → Preset → Expression apply method on double click:** **Confirm**, **Replace**, or **Append**.
* **Alt + double-click:** replace existing expressions without the confirm path (same idea as “replace” shortcut).
* **Shift + double-click:** **append** to an existing expression.

## Running scripts

* **Double-click** a **script** preset to run it.

## Managing presets

* **+** add preset: name, expression or script body, notes; toggle **E** vs **S**; choose **local** vs **cloud** where offered.
* **Grab** (hand): capture expression from selected properties into a new preset.
* **Right-click** context menus: **Edit**, **Add new**, **Export**, **Delete**, **Move to cloud**, **Save to local**, etc., as shown in the UI.
* **Import** exported JSON bundles; **Import old presets** (M Expression migration); **Import script** (`.jsx` / `.jsxbin`) into the library where supported. Some third-party scripts that require a specific ScriptUI install may not run from Mute alone.


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