ELMA switch.

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When choosing an ELMA switch there are Shorting and Non-Shorting options.
(e.g. 2 Wafers 2 x 24 Shorting °15 and 2 Wafer 2 x 12 Non-Shorting 30°)
I'm not sure I understand the difference.
Can anyone explain, please?

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I don't need your interconnect.
It's the output of the Source and input of the Receiver to the attenuator that matter.
Are they AC coupled or DC coupled?
Do either have grounding resistors to dissipate charge while the switch is moving between contacts.

If you have a make before break, the switch contacts should never be open. The noise suggests that either the Source, or the Receiver, or the switch are inappropriate to the duty.
 
That's a 4P1L pre-amp. The Source is a standard CD player, I have no idea how its output wired. I have no buzz nor hum when the preamp is playing music. Only when I switch it louder or quieter with a fast stroke it pops. If I do it gently and very slowly it switches without a pop.

 
fast switching may be inducing contact bounce.
DC coupling will then create a voltage step.

Show a schematic for both the CDP output and the Pre-amp input.

You must close couple all your Flow and Return Pairs.
That applies to signals and power and outputs, everything.

And if possible make all those pairs twisted.
 
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