When you add new props to a show you already have, your controller has to learn about them and your sequences have to be reworked to include them. L Designs Plus does both. We map the new props onto your controller and revise each of your existing sequences so they join in with the rest of your show. Quantity = the number of sequences you already run. For example, 6 sequences = 6 × $10. The Design Your Show quote works this out for you. This isn't the same as buying a new sequence. It updates the shows you already own. No music is included or changed; you keep using your own copy of each song.