Essentially Pin 1 of the 4066 connected to the contact trace and pin 2 connected to the common trace, which is typical of some keyboard that use a matrix system to detect which key is pressed. ![]() ![]() The idea was to solder to the keyboard matrix a series of 4066 switches that could be opened by the trigger input. I had an idea once to add a sequencer to an old keyboard using triggers pulses from a 40106 (easily expandable to be triggered from anything).
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