# Mask Enable

| Message                      | Description                                                | Arguments |
| ---------------------------- | ---------------------------------------------------------- | --------- |
| `/mixeffect/usk/mask/enable` | Turns on, off, or toggles the mask for the upstream keyer. | Multiple  |

| Argument | Type    | Description                                          |
| -------- | ------- | ---------------------------------------------------- |
| Enabled  | Integer | <p>0 = Off<br>1 = On<br>2 = Toggle</p>               |
| USK      | Integer | One-based index of the Upstream Keyer. Default is 1. |
| M/E      | Integer | One-based index of the Mix Effect Bus. Default is 1. |

> **Note**: If you want to set the mask enable setting for the DVE upstream keyer, use the USK DVE Mask Enable action.