Patent ID: 7674968

Claim:
A musical instrument for producing tones, comprising: plural manipulators selectively depressed by a human player for specifying an attribute of said tones in a performance of a music tune; a tone generator connected to said plural manipulators, and producing said tones having the specified attribute; a sensor unit provided in association with said plural manipulators, and producing a detecting signal representative of the depressed manipulators; plural messengers having plural actuators respectively associated with said plural manipulators, said plural actuators independently moving the associated manipulators for bringing said human player a notice of mistakenly depressed manipulator through a tactile impression of said human player in said performance; and a controller connected to said sensor unit and said plural actuators of said plural messengers, supplied with pieces of music data expressing at least said attribute of tones to be produced in said performance of said music tune, and comparing said attribute of tones expressed by said pieces of music data with said attribute of tones specified by said depressed manipulators in said performance to see whether or not said human player correctly depresses said manipulators in said performance of said music tune so as to make said messengers associated with said mistakenly depressed manipulators bring said human player said notice of mistakenly depressed manipulator through the associated actuators when the comparison results in inconsistence.