Here's a video of the om-250 made better by Ben Houston. This work is highly digital by comparison to all of the older models of omnichords, which has it's ups and downs like anything else. One of the ups proper is the midi.
Toward the end of the video you get a taste of the new sequencer by Arius Blaze. There will be more on that soon.
For more photos and info see the previous post: http://folktek.blogspot.com/2009/07/modified-omnichord-om-250.html