multilevel storage elements
What I'm looking for is a relatively simple solution that will fit
  within these parameters: 1) will accept an input voltage between -5V
  and 5V 2) will store that voltage until directed otherwise (volatile
  is okay) 3) will output that voltage while it is stored 4) is
  available in a dip package.


Looks like a sample and hold IC is what you're looking for. The LF398 fits your requirements. There are lots of other chips that do the same basic function with different trade-offs. I've seen sample and hold IC's with multiple channels as well.

Note that analog sample and hold circuits are never ideal. You will see the output voltage drift over time. You can minimize this effect by doing good pcb layout and picking high quality components, but the effect will always be there.