Touch sensor - voltage output?

(arduino / electronics newb warning)

So I've been checking out the QT113 for touch sensing http://www.instructables.com/id/DIY-Touch-Sensor/

unfortunately, it only outputs logic on/off, and for my project I was hoping for some voltage readings...

there's a good thread about setting up a little circuit to detect touch/proximity http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1171076259/0

but would this be the best way to do it? are there any IC's someone can recommend? i found these on digikey http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=MPR084EJ-ND

but they're made for touchpads and look a little too complicated for my experience level.

simplified explanation of my project:

say you have a 1.5 foot by 2 foot piece of aluminum foil hooked up to your sensor/circuit. i want to generate sound (with the supercollider language, if you're curious) based on approximately where the foil is touched. i don't really care where someone is touching it, but if they rub from one end to the other, i want to try and use the difference in voltage to feed my music-maker some more info than just whether they're touching or not.

there might be some other issues - noise, or the difference between voltages being too small...i'm too inexperienced to tell what this would realistically be able to give me.

the other thread i mentioned above looks super simple too...do you think that just putting a resistor and wire+foil between two pins would do the job fine (i know...in the time it took to type this i could have just tried it :)) but i'm curious if there's something else for this purpose?

thanks a ton! sorry for my super long question! josh

say you have a 1.5 foot by 2 foot piece of aluminum foil hooked up to your sensor/circuit. i want to generate sound (with the supercollider language, if you're curious) based on approximately where the foil is touched.

I'm more curious about which of the properties of a sheet of aluminium you're going to exploit to permit you to detect where it is touched, even approximately.

haha, i'm realizing i need to just try this. have you ever seen a ribbon controller? i was imagining that the difference in capacitance if you grounded it far away from the wire, as opposed to really close, would give you a difference. i just want to have a little bit of a spectrum to work with, to create the illusion of the user having a little control over what's going on. i want the sound to be different if they just touch it vs if they swirl their hand around on it. does that make sense? is aluminum foil the wrong material?

But a ribbon controller is a contact device, I think, making a variable resistance along its length.

You may have bitten of quite a lot with this one.

Possibly a lattice of vertical and horizontal strips of foil, separated by a thin insulating sheet, and maybe you could use the same principles as the Quantum device to sense disturbances to the capacitances.