Those FET's are J112 jfet's.
"N-Channel Switch. This device is designed for low level analog switching"
They are like a normally closed (on) switch.
Hense the low ohm's reading to ground.
Now give the gate pin a voltage & walla, they are turned off.
I think what you are looking at is the 'mute' circuit.
Not being aware of what is on pin WCH, I would guess it is a voltage that ramps up at power on.