The Input tab controls choreography parameterization. By default, choreographs are parameterized by the usual animation time, but here you can set up other kind of dependencies as well. For example, thickness of a muscle can depend on a skeleton angle.

The input parameter can be changed as follows:

By selecting an object from the select window, then choosing the corresponding object type from the selector in the 'Input' area and pressing the 'Change' button. After that, the choreography window displays the attributes of the chosen object and you can activate a suitable parameter for the choreography. For example:

To summarize, the input control gadgets are: