You can use a keyboard object to create notes with the mouse. A keyboard object also displays all notes passing through it. In this sense, you can think of it as a real-time, MIDI note on monitor. Although you can record the output of the keyboard in Logic Pro, its main purpose is for testing and monitoring in the Environment.
Keyboards have the following parameters:
Channel field: Sets the MIDI channel for the keyboard’s output.
Velocity field: Determines a fixed velocity value for all notes.
Lowest field: Defines the octave of the lowest note on the keyboard object. You can resize the keyboard to control its range above the lowest note.
Choose New > Keyboard.