Can anyone explain how an analog patchbay works?

Does anyone know an easy way to explain to someone else how half-normal and full-normal modes work on an analog patchbay? This is a really difficult concept to try and communicate.

If I need to show an incoming student, do you think the best way to do this would be to pull a patchbay out of a rack, and have them patch up a guitar to three or four guitar pedals to grasp the concept of the signal flow?

If you were explaining this to someone for the first time, would you start full-normaled then explain how half-normal is basically like using a splitter ABY box?

Top jacks are always used as outputs.
Bottom jacks are always used as inputs.

Rear panel jacks are connected, but are broken when a front panel connection is made.

Rear panel jacks are connected, a connection made to the top row jack of the front panel does not break the connection, but a connection to the bottom row jack does break the connection.

I would start with a full-normal operation and yes, a series of guitar pedals would work as a good example of signal flow. Iā€™m not sure if you would need to pull the patchbay out of the rack.

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