Yeah, with a bit of distance. I mean like if it's half a meter away from your speaker cables or amplifier, a switch putting out excessive EMI could couple noise

Yeah, with a bit of distance. I mean like if it's half a meter away from your speaker cables or amplifier, a switch putting out excessive EMI could couple noise in to that over the air. But it will do absolutely nothing to the actual data. EMI can be a real problem especially for things like recording electric guitars, because electric guitar pickups are basically antennas and have to be exposed to be able to pick up the strings.