using electric feedback

Instruments in which the tones are generated by electromechanical means > using mechanical resonant generators, e.g. strings or percussion instruments, the tones of which are picked up by electromechanical transducers, the electrical signals being further manipulated or amplified and subsequently converted to sound by a loudspeaker or equivalent device > incorporating feedback means, e.g. acoustic > using electric feedback

Instruments in which the tones are generated by electromechanical means > using mechanical resonant generators, e.g. strings or percussive instruments, the tones of which are picked up by electromechanical transducers, the electrical signals being further manipulated or amplified and subsequently converted to sound by a loudspeaker or equivalent instrument > incorporating feedback means, e.g. acoustic > using electric feedback