Move footer back to the bottom (from the right-side experiment). Put
a background on it so that it doesn't run into samples that may be
added at the bottom. They will scroll though so you'll always be able
to see all your samples.

Footer rotated 90 degrees and reads vertically bottom to top on the
right side of the page.

Don't like this version. Going to try something else.

Moves the clip lines farther into the progress bar such that the drag
handles appear inside the progress bar. This ensures that the
thumbnail is not covered by the left drag handle.