This short demonstration shows my little invention: CV-source dedicated for Dub-Step drops. Unlike regular fader, this one has its maximal value on the middle position. Schematics available. It’s very simple and it’s free for non-commercial use.
You can get schematic here: http://ic.pics.livejournal.com/rpocc/…
R2 and R3 can be replaced with 4.7k to increase the sweep width.