thanks for finding the fault.
and the 1n4001 look backward for me
You are right, the 1N4001 is drawn in wrong orientation, here the corrected schematic.
fat = spst
clip = on-on or on-off-on?
treble = on-on or on-off-on?
Fat: off on.
Clip: on off on.
Treble on off on
I read the datas of the built-in J201:
Vgs(off)=-0,72V at Id=5,2µA
Vgs(on)=0,38V at Id=1,26mA
gfs=1,9mA/V at Id=0,8mA to 1,3mA
Idss=0,58mA at Vds=3,01V
Rds(on)=549,1O at Id=1,3mA and Vgs=0,0V
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