Yet another case of interference success when two tones sounded jointly deliver a subjectively heard 3rd tone. When this 3rd tone is lower in pitch than the first two, it is known as a difference tone; i.e., its frequency is definitely the distinction between the frequencies of the two https://socialtechnet.com/story5253004/helping-the-others-realize-the-advantages-of-illusion-of-kundun-mu-online