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I think the older systems such as Accutint (RCA) Auto Tint Guard (Zenith) and so on just changed the characteristics of the color demods to make control adjustment less critical.
Some of the systems that are billed as "Auto Color" such as Accumatic (RCA) and Chromatic (Zenith) and a whole bunch of other names, ITT, APS, One Button Color, etc. mainly switched to a group of preset controls so that if the user really messed up the manual settings he could push a button to activate the presets. These may have incorporated the auto-tint function as well.
On the Magnavoxes the Chromatone tends to give the picture a sepia tone by increasing the red level and decreasing the blue and green. I think that is all it does.
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