AMP1 + external footswitch - why don't all footswitches with LEDs work?
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The switching process with footswitches connected to the footswitch socket of the AMP1 is carried out by measuring the voltage at this socket. Footswitches without LEDs always work. A footswitch with an LED without an internal series resistor also works. In the case of footswitches with LEDs, however, the series resistor can be so large that the voltage drop is not sufficient to trigger the switching process.