For Autoformer Volume Control we have a term and definition in Home Theater.

A device used to control the volume output from an amplifier (or speaker selector) to a pair of speakers. Autoformers offer sound quality superior to that of L-pads or purely resistive volume control designs, while minimizing power loss and heat dissipation. Niles in-wall volume controls, SVL-1, SVL-2, SVL-4, SVL-4 A/B, SVL-6, SMS-10, and MSA-10A products all feature autoformers in their design.
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