Re: Cretinous idea - The combined volume pot and mains SW.
There was the combined volume control/on-off switch which solved part of the problems. Can't remember the manufacturer, but you turned it to alter the volume, and push/pulled it to operate the switch.
It saved the wearing out of the track, and meant that volume could be as last-used.
Of course, it still needed the mains wiring to be brought close to the signal, and it introduced the new problem of knobs being out of line in one position - it it was positioned within a group of similarly-knobbed controls, that is. Though, surprisingly, with about 1/8" of movement, one knob sitting proud (or back) did not look obvious.
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