Apple DVD Studio Pro 4 - Manual (Page 632)

Function Keyboard shortcut
Stop.
K
Frame step forward, or with slideshows, advance to the next slide.
Step one second forward (not applicable with slideshows).
shift
Frame step backward, or with slideshows, go back to the previous
slide.
Step one second backward (not applicable with slideshows).
shift
632 Appendix A Keyboard Shortcuts