Problem
1. Write a function that ‘adds' two sounds together by adding their corresponding values. What does the result sound like?
2. Write a function that interleaves two sounds, one played normally, and the other reversed. It starts with 2 seconds of the first sound, then the last 2 seconds of the second sound, reversed. Then it takes the next 2 seconds of the first sound, and so on, until both sounds have been fully copied to the target sound.