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Quadraphonic sound
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=== Quadraphonic 8-track tape (Quad-8 and Q8) === [[RCA Records]] followed, in April 1970, with its announcement of a four-channel version of the [[8-track tape]], named ''[[Quad-8]]'' or ''Quadraphonic 8-track tape'' (later shortened to just '''Q8'''). These eventually appeared in staggered releases (70 Tapes) split by October, November, and December 1970. The format was almost identical in appearance to stereo 8-tracks, except for a small sensing notch in the upper left corner of the cartridge. This signaled a quadraphonic 8-track player to combine the odd tracks as audio channels for program 1, and the even tracks as channels for program 2. The format was not backward-compatible with stereo or mono players; although quadraphonic players would play stereo 8-tracks, playing quadraphonic tapes on stereo players resulted in hearing only one-half the channels at a time. The last release in the quadraphonic 8-track format was in 1978, although most had stopped appearing by the end of 1976.
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