Re: Cretinous idea - The combined volume pot and mains SW.
"where the on/off was combined with the wavechange switch - meaning hum-modulation of the local-oscillator! " this was more or less the case with this SW/pot. It formed part of a tremelo circuit, it was modulating the combined tremelo/signal, so you had a tremelo, tremelo sort of effect!
A.
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