When a Feedback parameter is selected in the parameters list, the following user interface is displayed:

Feedback parameters can be mapped to output ports in the composition. The purpose of a feedback parameter is to display the value of that output port to the user, inside the parameter inspector. The Feedback parameter is only updated after each render. Currently, the feedback parameter supports two types of ports: String and Image outputs.

The Parameter height option lets you decide the height of the parameter inside the inspector. The width is not adjustable, and it is determined by the host, dynamically.

The Minimum refresh delay option lets you put a maximum limit on the number of times the feedback parameter will be refreshed. Generating an output image can be expensive, and more so to display the output image inside the parameter inspector. Choosing a slower refresh rate may help maintain acceptable performance levels.

The Alignment option, available for both String and Image inputs, lets you control the alignment of the content within the parameter inspector.

When the current output port is of String type, the Font and Size options let you choose how the text is displayed to the user. Every host uses a different font size to draw parameter labels; if you wish to display text in the same size as the host labels, enable the Same as host UI option. Currently that font size is 9pt in Final Cut Pro and Motion, and 11pt in After Effects.

The Placeholder option lets you enter text (or pick an image) that will be displayed to the user before any output has been rendered. A feedback parameter can only display the value of an output port if the composition has been given at least one chance to render. If that hasn’t happened yet, or if rendering is disabled, the placeholder value is displayed instead.