Post #2378863

For a rather strange writing-related reason, I had to look up 4k hz tone this morning. I found this 10 hour youtube of a 4k hz test tone. What I didn't expect is for it to get really interesting, somewhere around the 6 and a half hour mark. Before you ask, no. It's still just the test tone. What secrets can you reveal, test tone? What does everyone else know that I'm missing?