> 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/shortcuts/actions/change-bus-source.md).

# Change Bus Source

### **Parameters**

* **Video Source**: a video source that meets the requirements for being in the meAndFillSources group.
* **Bus**: Program or Preview.
* **Mix Effect Block Index**: The Mix Effect Block to change. Default is M/E 1.

Tapping on either the Video Source or Bus field will display a menu with the supported options.

### **Returns**

Video source object.