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# 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="/files/CNC5RDnYMR6OfnS1U61W" alt=""><figcaption></figcaption></figure>

Select Play > Articulations in the OPUS player

<figure><img src="/files/lBKPqKdVExKpADb2bgsD" alt=""><figcaption></figcaption></figure>

Select an Articulation

<figure><img src="/files/iukSbYt3CZw2uTgXEAN3" alt=""><figcaption></figcaption></figure>

Now you should be able to switch articulations just fine.