A different situation of interference outcomes when two tones sounded together develop a subjectively heard 3rd tone. When this third tone is decreased in pitch than the initial two, it known as a change tone; i.e., its frequency is the distinction between the frequencies of the two primary tones. https://worldlistpro.com/story21695208/not-known-factual-statements-about-illusion-of-kundun-mu-online