27. The arrangement as defined in claim 25 said means continuously responsive to operator input measures motion into substantially perpendicular directions; and further including transducer means to resolve said motion into components in the two substantially perpendicular directions; said system further including frequency tuning means; whereby one of each of said components of motion affects the frequency location of one of each of said resonant peaks or formants.
27. The arrangement as defined in claim 25 said means continuously responsive to operator input measures motion into substantially perpendicular directions; and further including transducer means to resolve said motion into components in the two substantially perpendicular directions; said system further including frequency tuning means; whereby one of each of said components of motion affects the frequency location of one of each of said resonant peaks or formants. 34. An arrangement as defined in claim 27 wherein said transducer means to resolve said motion into components consists essentially of: a movable first surface; said first surface containing a conductive coating on its underside with electrical connection thereto; a fixed second surface; said second surface containing a resistive coating of between 100 to 100,000 ohms per square; a plurality of insulated spacers located between said first and second surfaces to cause said first and second surfaces to be non-contacting in the absence of external force on said first surface; a plurality of spaced electrical connections to said second surface; said spaced electrical connections arranged around the perimeter of a substantially rectangular area, with provision to cause a source of fixed potential to be alternately connected across only those of said spaced electrical connections which are on one pair of facing edges of said substantially rectangular area, then connected across only those of said spaced electrical connections which are on a second pair of facing edges, perpendicular to said first pair of facing edges, leaving those of said spaced electrical connections which are alternately not connected free to assume the potential developed in said second surface; a pair of voltage-detecting devices capable of retaining the value of an input voltage signal during a period in which said input voltage signal is disconnected; said input voltage of each of said voltage-detecting devices connected to said electrical connection of said first surface in such a manner that one of said voltage-detecting devices is connected when said first pair of facing edges is connected to said fixed potential, and the other of said voltage-detecting devices is connected when said second perpendicular pair of facing edges is connected to said fixed potential; such that pressure applied to a point on said movable first surface will deflect it into contact with said second surface, causing a signal to be delivered to said pair of voltage-detecting devices in synchronism with the application of said fixed potential to said pairs of facing edges so that each of said voltage-detecting devices will produce a voltage proportional to the distance from one of said pairs of facing edges to the point of application of force.