[Alan Anderson]

For an application like this, some people would suggest Case blocks, but I prefer using Select functions. They switch between one of two input values based on a boolean input. The cascaded Select for the Wheels motor will output 1 whenever Button 2 is pressed, -1 when Button 2 is not pressed and Button 3 is, and 0 when neither button is pressed. Change the constants to make the motors run at something less than full speed.