Sansui AU 9500 loudness

Need a little help , I have a near mint au9500 in bench . Everything is original and fully working but not the loudness.
The original volume pot was replace for a modern blue alps . This has no tap for loudness so the wire from pcb have been isolate .
Now I like to have it again ,. I don’t mind if loudness depend on volume pot position . Just switch loudness .
I have tried with 3 resistor value 3/10/47 K.
First I solder the resistor from tap wire link to the middle of pot . No difference
Then from tap link to ground.... no difference .
I think need two resistor one from input of pot to tap and another from tap to ground .
Someone can help me or maybe already had experience.
Just a little and show schematic part
 
Schematic part att.
Green spot is the tap
 

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