One input terminal connects to the top of the pot and the other is grounded as is the bottom of the pot. The loudness on/off switch is a double pole double throw. Swinger A connects to the input terminal. The off position of A connects to nothing. The on position of A connects through cap C1 to the fixed tap on the volume control. Also connected to the fixed tap is a resistor R1 in series with a cap C2. The other end of C2 goes to ground. The junction of R1 and C2 connects to the swinger of part B of the switch. The off position of B goes to ground and the on position goes to nothing. The wiper of the pot, P1 goes to the output terminal and the other output terminal is grounded. No component values are given. End verbal description.