Reddit reviews Phone Connectors 1/4" MONO SWITCH SOLDER JACK (1 piece)
We found 1 Reddit comments about Phone Connectors 1/4" MONO SWITCH SOLDER JACK (1 piece). Here are the top ones, ranked by their Reddit score.
I imagine they are using switching jacks.
https://www.amazon.com/Phone-Connectors-SWITCH-SOLDER-piece/dp/B000PHCWUY
In the jack above, inserting the plug interrupts the normal path (coming in from right side) and sends the signal to the plug instead of the output terminals on the left side.