Board Thread:Fun and Games/@comment-26305554-20150719003342/@comment-1203476-20150803170947

Male voices are often lower than female voices. By slowing the song down, you're making the sound lower.

Sorry to say that but it's common knowledge and has been done hundreds of times in the past, you didn't discover anything. This kind of trick has been in use for decades, it's also the way they make voices higher like for Chip and Dale or Alvin and the Chipmunks, by speeding up.