> 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/auto.md).

# Auto

| Message           | Description                                                  | Arguments |
| ----------------- | ------------------------------------------------------------ | --------- |
| `/mixeffect/auto` | Performs an Auto transition on the selected Mix Effects Bus. | Integer   |

| Argument | Type    | Description                                          |
| -------- | ------- | ---------------------------------------------------- |
| M/E      | Integer | One-based index of the Mix Effect Bus. Default is 1. |

> **NOTE**: This command is different from the SuperSource Auto command in that it always performs an Auto transition between the Preview and Program source, whereas the SuperSource Auto command performs as Auto transition between Program and SuperSource.


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