Edit a downloaded animation?

So I have downloaded or bought a animation on a website for G3M and G3F Characters.
But I wanted to edit the breast bumping. For me, the breasts are moving quite too far. I usually work with the breast and glute control for G3 Characters.
Is there a way to delete the breast animation and build my own on the existing animation?
Because the breast is moving, but my control parameters are set to 0%.
Comments
Is it a standard animated pose or an AniBlock?
It is a standard animated pose.
Try selecting one of the Pectoral bones, then look at Timeline to see if there are any keyframes marked.