

Scott says:

It's a demo of my dad's new Voice Box (harmonizer/vocoder) as performed by a pair of really talented folks I found via YouTube (I found Jack and Nataly when researching user-generated videos for the new EHX site).

The Voice Box's harmonizer is vaguely like Songsmith, in that you feed it a mic and an instrument, and it can then create multipart vocal harmony — the vocoder is totally different, it give more of that robotic man-machine sound.