Abstract: By providing as circuit activators flexible, intentionally damped, vibratory elements, for example strings, the resonant frequency of which may be unrelated to the tone to be generated, while utilizing electronic circuits controlled by such flexible elements for tone generation and modulation, the instrument according to this invention provides a range of "voices," attack, sustain and decay envelopes and other tonal characteristics which cannot be achieved with conventional mechanically resonant systems (such as are found in an acoustical guitar) while providing the performer with the tactility and dynamic expression with which he can identify.

Abstract: An improved artificial reverberation system utilizing a unitary electro-acousto-electrical transducer of the electro-dynamic type in combination with means for eliminating the driving signal from the delayed output signal, such means including out-of-phase-signal cancellation circuits or time multiplexing circuits coupled to or integral with the unitary transducer achieves a high order of discrimination between driving and reflected signals in the system, thus permitting the use of a single transducer for both injecting signals and extracting reverberation signals.