Part 6/8:
How did this multifaceted sound embedding become a reality? The stereo cutting of grooves involves employing a pair of actuators that cut the groove at angles—each corresponding to the left and right channels of sound. When sound is the same in both channels, it produces a mono-like effect that can be enjoyed on any standard phonograph. When there’s a variation, the sound utilizes both stereo channels effectively.
This cleverly contrived method provides backward compatibility for mono records, ensuring that even old phonographs can handle stereo records without sacrificing sound quality.