The sling power is on the shipping setting for v14. I think that's "high" setting.
I wasn't paying perfect attention, but I think the ball crawled up the lane from the left flipper toward the sling, but had so much crazy spin on it, that it caught a grip with the rubber and pulled itself up under it. We thought it had drained, but really it just vanished right before us. After looking around, we found it under the left sling. Wow.
It was a very cool visual effect watching the ball just vanish. Neither one of us saw it go under the sling, it just vanished, & it was just a 1 ball on playfield point in time.