Oh, I got it!! I was trying to flexi-bind group layers.... apparently that doesn't work. When I bound the individual layers inside the groups, it works!!
Whew.....

I'm using raster art from Photoshop. I've spent hours creating bones and flexi-binding them to layers. No matter what I do, the bones are still affecting other layers that are bound to other bones. I've tried starting with the layers moved apart in space, and adjusting the bone strengths. I've tried...

YES!! Thankyou thankyou thankyou

I'm trying to rig a character I created in Photoshop. For the arms and legs, each arm and leg is on its own separate layer, but I have the whole arm as one layer, the whole leg as one layer, etc. When I add a bone for the upper arm and a bone for the lower arm and then test it by rotating the lower ...

Thanks, that's a good idea, but I forgot to mention that I'm working with Photoshop files. I guess I could do what you said though, by duplicating the mouth layers at different places between open and closed. I'll try that!

I'm pretty new to Anime Studio Pro. I see that I can use a switch layer to auto lip sync static mouth poses with an audio file. But what if I want to sync a bone dial with that audio file, so that instead of switching from mouth closed to mouth open, it would smoothly interpolate from closed to open...