Uhh... The video's audio is actually pretty fake I'd believe. Seeing how it literally is "THE LAVENDER TOWN MISSING FREQUENCIES" video. if you want to "solve" the "mystery", may I grant you an actual "10 minutes of Lavender Town" video instead of fake edits of the music itself. I have researched into the missing frequencies and there actually is a way of placing the Ghosts, Unowns and such into the music. Sorry to say but you, like millions, have been misled.
youtube.com/watch?v=VslxFpXQi7g <-Here is an actual 10 minutes Lavender Town music
youtube.com/watch?v=YedxzpHpRz8 <-Here is part 1 of a 2-parter explaining the mystery.