A mechanical pitch shifter for changing the pitch of a stringed musical instrument is disclosed. The closure includes a tamper-indicating band having a plurality of sloping teeth. Thus, the voice of each remote party in communication with the user of the communications system is modified artificially by a transformation Ti, thereby making it easier for the user to perceive and discriminate between simultaneous voices from the remote parties. Titanium silicide is disposed on the dielectric layer, sidewalls, and the exposed portion of the semiconductor substrate.