Work in progress. Picoboard sensors connected as follows: A turns trumpet on, B is valve 1, C is valve 2, D is valve 3. Amount of "air" required to produce notes with the same valve presses is determined by the slider. Inspired by Josh Burker (jjburker)'s MaKey MaKey PicoBoard Trumpet. http://scratch.mit.edu/projects/jjburker/2961558
