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The Haeco-CSG or Holzer Audio Engineering-Compatible Stereo Generator system was an electronic analog audio signal processing device developed by Howard Holzer, Chief Engineer at A&M Records in Hollywood, California.
His company, Holzer Audio Engineering, developed the system in the 1960s during the years of transition from mono to stereophonic sound in popular music recording. The process was used primarily from about 1968 until 1970 but still exists on a significant number of recordings made during the time.