Abstract: A mechanical pitch shifter for changing the pitch of a stringed musical instrument is disclosed. The mechanical pitch shifter engages the musical instrument string between the end of operational length and point of string termination. This device comprises a base clamp 1 and thumbscrew 2 to attach to the musical instrument. This devise comprises a top bar 6 and cam 8 to engage and disengage the musical instrument string. Reaction force of the string is opposed by the thumbscrew 2. Fine tuning of the string pitch is achieved by turning a thumbwheel 3 thus changing the displacement between top bar 6 and base clamp 1.

Abstract: A speaker cabinet design for providing adjustability of the number of speaker cabinets contained in a speaker array comprises female connectors (50) along the front and back edges on the top and right sides. A user of the cabinet can attach a mating second cabinet to any side of the first cabinet by inserting male connector (40) in the pass through assembly and securing to the female connector at all locations on that side. A user can connect a second speaker cabinet in a series or parallel electrical connection. This allows the user to build up to the desired number of speakers without purchasing a full speaker array. Furthermore, once the desired array is complete the user can remove only the number needed for transport. A variety of different speakers can be preloaded in the cabinet at the factory, thus giving the user flexibility in sound without having to remove and install different speakers.