double tracking or doubling is an audio recording technique in which a performer sings or plays along with their own prerecorded performance, usually to produce a stronger or bigger sound than can be obtained with a single voice or instrument. great to meet the architect today and share his delight at the end product. mike goes to see betty who has changed her mind and wants to leave school right away to get married. (it was also known as "tennis house".) in october 2012, the first oh-58f was finished. this was part of the north kent line. 