LEAD SCREWPITCHSTEREOCUTTERDEPTH
Left channel, left wall (gold) · right channel, right wall (blue)Numbers in groove depths: 1.00 is the depth cut at rest (modelled, from each part's low end)A stereo record holds two channels in one groove: the left on one wall, the right on the other, each at 45 degrees. A centre part moves both walls together, so the stylus swings sideways, which a mono pickup reads. Watch runs 100 times slower; Listen plays at real speed.

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