> For the complete documentation index, see [llms.txt](https://support.babylonwaves.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://support.babylonwaves.com/trouble-shooting/opus-isnt-switching.md).

# OPUS isn't switching

This is an unresolved bug in the OPUS player. OPUS sometimes loads iob/iot files and no articulation is selected.  There's how you can make it work:

Drag the .oib file onto the OPUS player.

<figure><img src="https://3950957827-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FrEyqpGWlfvQJYXmMoMlO%2Fuploads%2FI9jq9uKGjmko0TVC9Pbr%2Fimage.png?alt=media&amp;token=2da7c805-3a66-455e-9d2f-76616a73c249" alt=""><figcaption></figcaption></figure>

Select Play > Articulations in the OPUS player

<figure><img src="https://3950957827-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FrEyqpGWlfvQJYXmMoMlO%2Fuploads%2Fk4QYT07u2P0jPSy6RWSP%2Fimage.png?alt=media&amp;token=c025e41f-2fb6-4da5-b31a-667c37de699d" alt=""><figcaption></figcaption></figure>

Select an Articulation

<figure><img src="https://3950957827-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FrEyqpGWlfvQJYXmMoMlO%2Fuploads%2FuMkzTnOn5q8FbuNfM03A%2Fimage.png?alt=media&amp;token=d61de210-2d2b-41ea-85d3-b9b2b9342c72" alt=""><figcaption></figcaption></figure>

Now you should be able to switch articulations just fine.