Tone synthesis apparatus synthesizes a tone of a wind instrument generated in response to vibration of a reed contacting a lip during a performance of the wind instrument. The band includes radially-extending opposed flanges each having an aperture for receiving the bolt. In addition, a polyacrylamide aqueous gel, in which the size of the dry granules is 0. In other words, the leak component output from the multiplier is cancelled. The socket holds the hub rotationally fast allowing the syringe S and needle assembly A to be unscrewed, and an ejector means located in the housing ejects the unscrewed needle assembly A from the socket into a collection container located within the housing.