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Quads had 3 timebase correction systems. The first was automatic guide servo which corrected gross errors at the headwheel. On early machines this was a manual adjustment. The second was MATC mono automatic timing corrector. The third was CATC color automatic timing corrector. Some machines had CAVEC which corrected hue banding across a head.
The later machines like AVR3 and TR600 had digital TBCs.
As I recall M2 format was a full bandwidth analog system. I saw a demo once and it was outstanding!
Some stations even bought the M2 automation system for commercial playback! No stations in this market but there was one in Augusta GA. that had it!
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