yeah, I listened to it for awhile then looked at some of your answers. I thought it sounded like a skateboard on a half-pipe, but then sounded a bit like maybe a baseball pitching machine but click at end doesnt "crack" enough.
My closest guess right now is a:
"Tennis Ball machine shooting out a ball then maybe a racket hitting the ball"
its a little bit off though. also sounds like an old swinging bar door but ony half the sound matches.