AC-114, an aircraft I had not flown often. Standard power reduction on VFR downwind, speed below gear extension speed, hit the gear switch. Radio calls, traffic in the area, and watching the runway, on speed, flaps , turn base. Why am I so high, should be lower by now. Reduced power some more, but it was not enough to activate the horn. Did not want to slow down and come down, more flap, mind says somethings not right. Start looking around, more power reduction, there's the horn, yep gear not down. Not providing the normal drag to maintain a normal decent at normal power settings. If something does not seem right, if standard power, flap, etc does not yield expected results, something is not right. Mind goes on full alert to find the problem. Edit: I should add that it was a true gear fail to extend problem. I had one 1/2 way down, one still in the well, and the nose just had the doors open. Climbed out of the pattern, reviewed everything and emergency extend, free fall. Did not feel good about the gear until slowing on final and I heard/felt a thunk and the lights went green.