Have you ever wanted make a subharmonic synthesizer like the Moog Subharmonium or Mixturtrautonium in Reaktor? Simon Hutchinson has created just the tutorial for you; with a superbly explained tutorial on doing just that. In the video, he builds the patch from scratch - walking you through making a set of subharmonic oscillators and an envelope filter akin to the Moog Subharmonicon.
Here's an explanation of Subharmonics in his own words:
Subharmonics are frequencies that are whole-number divisions of a given frequency (in contrast to harmonics, which are whole number multiples of a frequency). While harmonics naturally occur as part of the timbre of a sound, subharmonics, when introduced, sound like distinct pitches, allowing you to create chords of harmonically-related notes.
BCR200 and Valhalla
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Twice as much synth, 2 octaves more