Thanks for help!
I’m not so upset. The sound very much is pleasant to me, and this is main thing. cool old sound.

Someone has pasted knobs=(
later…
potentiometers are made not in america
Doubt…

pedal has two more knob are on the right and at the left of TRS connectors (These knobs are not visible on a photo)
left knob – for volume/right knob marked “auto” – for switchings between the shifter & phaser
“the top left knob” (you asked) for adjustment of shifter effect
Three knobs on the right for phaser effect like on electric mistress deluxe, & range too.
i hope you understand, very bad know english

Forgive me for my bad English.

I have a pedal ehx bad stone deluxe
And I can’t find the information about it on this site.
maybe be it a fake?