Point taken. I'm only speaking in general. Wasted too much time. Think about how many graphs there. Every dial for each separate body part, between every keyframe. Frames are screaming past at 30 fps. You never know what went wacky. Could have been up the IK chain, maybe down. Plus there could be 1000 keyframes to keep track of, & you looked in the wrong frame section. Been there. If you're doing any length of animation, you don't need to be looking for a needle in a haystack everytime you turn around. Just going where I told ya, & behave yourself. I never noticed Linear Interpolation to be that abrupt. Much easier to fix than tracking down loose splines. But splines are certainly best if they could be kept on a tighter leash.