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. 31. The arrangement as defined in claim 27 wherein said transducer means to resolve said motion in the components in the two substantially perpendicular directions is a two-axis potentiometric device.