I sold my Omnichord OM84 for a frankly crazy amount of money on eBay last year but not before recording some samples. Here is the first of my resultant PCMSynth presets, the simple lead sound. Don't worry, it gets better!
If you don't know what an Omnichord sounds like then check out YouTube!
This is the awesome preset from my song wrath of the strawberries! As recommended I have uploaded it here for easy access and further discussion. Some aspects of the sound are missing such as mild distortion and some reverb/delay, but it is otherwise the same raw thick sound you've heard.
Enjoy.... run this thru a Distortion IFX and tweak to taste for a thick rough wobble.... I will have a YouTube Video on how to set this up, very soon...