I'm building custom hardware for my studio and one question keeps popping up: how to treat the GND connections?
A simple example: I have two mono inputs which go into a switch and from there to either stereo output A or stereo output B. One way to wire this would be to connect all GNDs directly (i.e. wire all GNDs of the input and output jacks together without a switch in between), the other way would be to use a switch with more poles and switch GND and V+ rather than just V+. Obviously with more complex setups there are a lot more connections required to route all GNDs, i.e. a lot cables to solder. Are there benefits to this approach or am I just wasting my time?