How do I use the custom I/O labels in Logic?

Go to Logic's Mix menu at the top of the screen and select "I/O Labels..."
There are several columns: Channel, Provided by Driver, User, Long, & Short.
To use the labels provided by the Ensemble:
- Click the button in the Provided by Driver column.
To enter your own custom label:
- Click the button in the User column.
- Double click the "-" in the Long column, type in a new name, then press Return on your Apple keyboard