Do you remember?
The Harris Phase Fixer consisted of two compact rack-mounted units. The first, a pilot encoder, injected an inaudible pilot signal on the audio as it was recorded onto tape. The second unit was the time base corrector. When an encoded tape was played, the time base corrector was automatically enabled, electronically reducing stereo phase error and flutter to insignificant levels. Tapes that were not encoded were played normally.
According to ads, the Phase Fixer improved the on-air sound by eliminating cancellation drop-outs and retrieving missing musical notes. The system used existing cart recording and playback equipment, and carts without modification. In 1985 Harris advertised that the source material could sound five to 10 times better. One Phase Fixer system could accommodate all the tape source machines at a station.