> 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/flying-key-rate.md).

# Flying Key Rate

| Message                          | Description                                  | Arguments |
| -------------------------------- | -------------------------------------------- | --------- |
| `/mixeffect/usk/flying-key/rate` | Sets the rate for the Flying Key transition. | Multiple  |

| Argument | Type    | Description                                          |
| -------- | ------- | ---------------------------------------------------- |
| Rate     | Integer | The number of frames from 1 to 250.                  |
| 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. |