& -- Split X pane & Ctrl-1 & Toggle $\frac{1}{2}$ horiz track timeline window panes. \\
& -- Split Y pane & Ctrl-2 & Toggle $\frac{1}{2}$ vert track timeline window panes. \\
& Mixer Viewer & Shift-M & Bring up a Mixer Viewer window. \\
& -- Split X pane & Ctrl-1 & Toggle $\frac{1}{2}$ horiz track timeline window panes. \\
& -- Split Y pane & Ctrl-2 & Toggle $\frac{1}{2}$ vert track timeline window panes. \\
& Mixer Viewer & Shift-M & Bring up a Mixer Viewer window. \\