> 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/mix-effects-bus/set-program-input.md).

# Set Program Input

| Message              | Description                                                                | Arguments |
| -------------------- | -------------------------------------------------------------------------- | --------- |
| `/mixeffect/program` | Sets the video source of the program input on the selected Mix Effect Bus. | Multiple  |

| Argument  | Type    | Description                                         |
| --------- | ------- | --------------------------------------------------- |
| Source ID | Integer | Integer that is the video source ID.                |
| M/E       | Integer | 1-based index of the Mix Effects Bus. Default is 1. |