My first full time Photo job consisted of being a professional printer for about 50% of the week. Foot switch was for making the exposure and a knee "switch" was for composing, focusing, and burning in. The knee switch was totally isolated from the counter so activating it (pushing it in) didn't initiate any vibration to the enlarger. I still use Lektra TM-8 Electronic Interval Timers (DURST 4x5 and Leitz Focomat V35), but have stopped to use knee and foot switches, preferring to be more minimalistic n the darkroom as far as equipment goes.
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