Behringer FC-600 expression pot value

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does anyone know what the potentiometer resistance is for the expression part of the Behringer FC-600

The service manual says
POTENTIOMETER;500 kohm;0.050W;TAPER:1B;20 %;STEREO;PITCH:2.5 MM;METAL SHAFT;DUAL POTENTIOMETER R1:500K R2:50K

and

POTENTIOMETER;250 kohm;20 %;STEREO;PITCH:5 MM;DUAL POTENTIOMETER R1:A250K;R2:B50K;METAL FSHAFT;F12MM;L20MM


But I can't make sense of that. anyone?

thanks