Quickly mute all keyframes

So something that happens more than I’d care to admit is that I’m happily posing my character just perfectly to convey whatever emotion or action that I’d like–then I realize that I forgot to advance the timeline. Subsequently I have to either go to the NLA panel and mute the object’s NLA strips or advance the timeline and start over.

Is there a key command to quickly and temporarily mute all key frames or channels or something? Alt-oops? Or some way to advance the timeline without having the animation update?

Just wondering. Thanks.