If you record the three vi


If you record the three videos onto DDRs (digital disk recorders, basically video decks that use hard drives instead of tape) with GPI triggers, you can just cue them to the start every time and close a switch wired in parallel to transistors attached to each (note that the transistors are a requirement, otherwise you’ll blow them all!, or you could just use a pushbutton that acts as three separate pushbuttons)

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