Shorting Jacks?

I never use them in pedals but have them for amp builds. They are absolutely needed in amps to ground unused input sockets and for combo speaker jacks for the main speaker. If the speaker lead gets pulled out the output is grounded which helps prevent transformer destruction.
 
I used some in my modular synth to make a Triple Attenuator/Passive Mixer.

In jack > pot > (switched) Out jack (x 3)
+ one Sum Out jack.
If you don’t plug into any of the individual Out jacks, they all go to the Sum. If you do plug into an individual Out, it’s removed from the Sum.

Use it mainly for mixing CVs. But you could definitely use the same idea for an audio mixer for pedals.
 
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