EUREKA!
I got it all working. Below is a screenshot of what I've done so far. If anyone is interested in the code or the Excel file, please just drop me a message with your email.
I really want to thank Harvy Ackermans for all of his help and encouragement! I highly recommend his product (eTCC). I've used it for a couple of years, and it inspired me to want to make a GUI for switch control. Thanks again Harvy!