> I tested the Ipad the other day and found the panel could be > polyphonic! > What kind of touch technology are involved in the Ipad? Capacitive? > Sound wave or IR? Capacitive. Slightly old, but good primer on the subject is here... <http://www.eetimes.com/design/embedded/4008781/Getting-in-touch-with-capaci tance-sensor-algorithms> Cheers, Colin f