Not quite an answer to your question but I caught in your post that wermy posted his teensy code? If I understood that correctly, do you have a link to that page? I'd love to see what he did for his buttons. Thanks!

Hi everyone, I'm having an issues getting my X , Y buttons to work. I found some teensy code for a gamepad on the net and altered it to reflect the correct pins. This worked fine until I drilled the two additional holes and added X and Y. They respond in notepad but aren't releasing correctly as a n...