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Hi
There are several aproaches to this, the easiest being a pot (cheap). A cheap switch or an expensive switch or a cheap switch with relays. FET switching could also be considered.
As long as the wiring is short (a couple of inches maximum. and you are careful not to let anything 'noisy' near it any technique could be good.
I favoured the cheap switch with relays as it allows me to be able to 'remote' switch the gains.
Matt S
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