Muti-turn pots seldom have their wiper as the 'center physical' pin, at least that is my first hand experience. But then i learned years ago to check any pot I was going to use to check it out with an ohm meter so I clearly understood what I had to work with. Even with simple signal turn pots I installed in panels would likely work backwards (as in full volume when turned fully anti-clock wise) if I didn't carefully measure first.