This paper well discusses the many existing technologies for resistive multi-touch
“A compendium of foundational circuits for interfacing resistive pressure and position sensors is presented with example applications for music controllers and tangible interfaces.”Reference: A. Freed, "Novel and Forgotten Current-steering Techniques for Resistive Multitouch, Duotouch, and Polytouch Position Sensing with Pressure," NIME 2009, 2009. http://archive.notam02.no/arkiv/proceedings/NIME2009/nime2009/pdf/author/nm090092.pdf
