You can use the following keyboard shortcuts for keyframing in MotionBuilder.
| Action |
Keyboard Shortcut |
| Add keyframe |
S |
| Add Zero keyframe |
Shift-S |
| Add Flat keyframe |
Alt-S |
| Go to next keyframe |
. (period) |
| Go to previous keyframe |
, (comma) |
| Key at Time x |
Ctrl-Shift-S |