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Is this something that others have done? It seems like something that wouldn't be so easy to do with just one switch. Sure, you could switch the ins and outs from the respective filters with a DPDT switch, but you couldn't share the controls, so either you'd need to add at least 2 knobs/sliders to the front, or come up with a fancier switching scheme. Relays? Some kind of digital switch? To share the controls, you'd need to be switching at least 6 wires, maybe more.