If the code does not work when uploaded to the CPX, you may have to use a code editor and REPL to figure out what's going wrong.

This is a common process in programming known as "troubleshooting" or "debugging".

A code editor and REPL will help you determine which part of your code may be causing errors.

Follow directions on how to download a code editor and troubleshoot issues with the REPL here.

Going Further:

How can you modify the examples from this guide to make even cooler programs with EduBlocks and the CPX? 

One idea could be to trigger different NeoPixel colors when drum sounds are triggered!

The possibilities are endless!