You can use the following keyboard shortcuts for keyframing in MotionBuilder.
| Action | Keyboard Shortcut |
|---|---|
| Add keyframe | K |
| Add Zero keyframe | Shift-K |
| Add Flat keyframe | Ctrl-K |
| Go to next keyframe | Right arrow |
| Go to previous keyframe | Left arrow |
| Add Key at time x | Ctrl-Shift-K |
| Add FK key | , (comma) |
| Add IK key | . (period) |