When the first professional tape recorders, with provision for synchronous playback from the recording head, were put on the market a few years ago by Ampex Corp., they were immediately accepted by the recording industry. Today most recording studios would consider it out of the question to purchase a multi-channel recorder without this feature. The pre-recorded tracks, played back from the record head, were meant to be used for cur purposes only, but studio engineers soon put this feature to another use. The track or tracks, played through the record head were mixed with other material from microphones in the studio and then re-recorded onto another track on the same tape. This procedure is known as -ping-ponging.- The requirement that a single head must be able to record a signal on one track while simultaneously playing back a signal on another track, presents several problems in head manufacture.
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