Help: JP12 BFR Pickup Wiring diagram / instruction help

Help: JP12 BFR Pickup Wiring diagram / instruction help

Hi all,
Wondering to know anyone get the stock JP12 BFR wiring diagram for reference?
I found my JP12 get mess if turn the tone knob in the piezo selector in the middle and magnetic pickup position, the sound will swap automatically (i.e. sometimes will cut the bass only come out treble frequency, while sometimes will mix piezo and magnetic pickup automatically.)

I would like to check if the current setting is correct, thanks your all buddies

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