The capacitor stores a charge and when you flip the switch it sends the current to ground causing the pop. To suppress the pop you use the 1m resistor to ground in the Maggie option.
The pop occurs in the switch so you must need the resistor directly off the end of the cap to center lug to prevent the cap discharge pop.
Not totally sure why a 4m7 resistor from center of switch to ground wouldn’t stop the pop verses using two separate 1m resistors.
I included a bright switch off volume pot if anyone want to use one. This is a two way and use what ever value silver mica cap you want to use. Or other types of caps.