Two octaves of saw wave from the microkorg, into ableton, then an EQ8 with 8 different automated parameters. Other than that, there's just a little delay on the highs and some reverb over the lot.
I had a really nice patch for the korg, with some cross modulation that was LFOing perfectly.. but I lost it somehow and hadn't saved, arrrgh. The second try wasn't so perfect, but it does alright.
The video is of the EQ8 (in ableton). I find it sort of changes the experience of hearing it when you have this visual feedback aswel.