> For the complete documentation index, see [llms.txt](https://docs.mixeffect.app/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.mixeffect.app/automate/osc/messages/upstream-keyers/chroma-parameter-adjust.md).

# Chroma Parameter Adjust

| Message                                  | Description                                             | Arguments |
| ---------------------------------------- | ------------------------------------------------------- | --------- |
| `/mixeffect/usk/chroma/parameter/adjust` | Adjust a single legacy Chroma upstream keyer parameter. | Multiple  |

| Argument         | Type    | Description                                                            |
| ---------------- | ------- | ---------------------------------------------------------------------- |
| Parameter        | Integer | <p>0 = hue<br>1 = gain<br>2 = ySuppress Edge<br>3 = Lift<br></p>       |
| Adjustment Value | Float   | -X to decrement the current value or Y to increment the current value. |
| 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.                   |