I just realised this would look all right on non-Kindle versions of EC.
It needs an infinite number of odd harmonics, but I don't have infinite patience. :) These 14 sine wave sources show the the principle very well anyway. I have forgotten what the relative values should be (voltages or mixer input resistors).
Triangle wave didn't come out so well:
http://everycircuit.com/circuit/5915167704743936
