A signal from a tuner is outputted to a primary display. A device may lock the hand grip to the handle with a pivotal pawl. A carrier output adapter having an inboard end, an outboard end, a cover attached to the outboard end and a mounting surface. Individual notes of the harmonizing tracks are manipulated based on a chord strictness threshold and an audio output is provided based on the audio input and the manipulated plurality of harmonizing tracks. By use of a fast setting or solid infill material the system gains sufficient strength almost immediately to withstand the rigors of handling during the lay operation. The brake device includes a swinging rod having one end pivotally connected with a preset portion of the frame body above the horizontal shaft and able to be actuated to swing downward by its own gravity.