Talkers are the agents which add control keys to the eigenharp keyboard, and when these keys are pressed the talker will 'say' a belcanto phrase. Any phrase that you can type in using the eigencommander or with the language keys can be added to a talker.

The activation input is used in the main to receive activation signals from an upstream Agent.

The light output is a connection made against the normal flow of signals to send data back to the Keyboard Agent to determine which LEDs should be lit at the appropriate time.

Talker Belcanto phrases are always tied a particular key on the keyboard.

Each key has a dedicated 'activate' port that is understood by clients like Stage to trigger the activation of the key as if it was physically pressed on the keyboard.