EP-3 - adjust the volume with the expression pedal

Hi,
I apologize for my English,
how do I adjust the volume of my voyager with the pedal?
I tried to add it in the input cv vol, but nothing
Thank you very much

Are you using a tip-ring-sleeve cable? It will have two lines of black insulation material on the plug. Most instrument cables are tip-sleeve cables with only one line of insulation. Good luck

Thanks, now I try

What model expression pedal are you using ?

I use a Moog EP-3 expression pedal

With the original cable included?