TS turned me on to a set of exceptional videos on YouTube from Hal Galper, a jazz pianist and teacher at Berklee. This one is I think my favorite, an excerpt from a master class. He explains that you play exactly and only precisely what you hear. If it's not coming out the way you want it to sound, it's because your aural imagination isn't strong enough, isn't vivid enough. I've experienced glimpses of the same thing myself, but not to the same level. It's about your hearing, and your imagination.