Most pieces you make with Max will have several states, or configurations of object data, such as volume levels, synth parameters, etc. We already learned how you can store data in presets. In a piece, you might want to change presets or play sound files at specific times. You do this by arranging a set of cues, each of which performs actions in response to a trigger, such as pressing a key on a keyboard or pressing a footswitch.
This exercise gives you a simple introduction to implementing cued state changes in a piece. You can use this approach for data-driven instrument pieces or pieces for acoustic instrument and electronics.