In this video short, a Simulator test of a 4 Octave Toolbox Trumpet in which the slide switch can be used to turn on and off the playing of notes, while 7 pixels indicate the digital notation of the note being played, and pixel 9 indicates which of the two momentary switch push buttons are pressed, from none = 1, to button A = 0, to button B = 2, and button A & B = 3. This demonstrates the Learning Check for Section 3: 4 Octave Toolbox Trumpet in the Blue Unit.