Caustic Song file (optional):
Actually, I think this is a process that relates more to electricty than audio, specifically for converting ac to dc, but I thought I'd see if I could do it in caustic and whether it would be worth the time.
Here's a short disussion on the subject and how it might relate to music production on another forum:
So I've found a process where I can completely remove either the positive or negative polarity of a sample in the wave editor and included a very basic example. If you look at the waveforms. (Pos, Neg, and Full) and how they play in the oscilloscopes you'll see what I mean.