As part of the oneString Kickstarter, I’ve just released the first demo video of the oneString controller.
Ribbon & pressure sensor -> arduino -> USB(MIDI) -> OSX or WIN -> synth software.
It looks like kits are going to land in the $50-$100 range depending on the sensor setup you choose. I’m using the Kickstarter to generate pre-orders, get larger parts quantities from suppliers, and keep the price down.
More info there: http://kck.st/zvTD9Q
The only trouble with a new instrument is learning to play it!