I've put jack inputs on most of my GPIO's, and I was wondering if I could have a multicord jack to patch one analog output into multiple analog inputs ?

Would it divide the voltages, or use too much power, or do something that shouldn't be done ?
If it is possible, couldn't I make a simple kind of dispatch-box, and maybe insert some kind of pot / variator on each output (so that I could dose the full PA4 range into all the different inputs) ? I don't know anything about electronics, so it's probably a silly question