electronic signal switch boxes and direct signal boxes for combining and switching audio signals, converting high impedance signals to low impedance balanced lines, buffering audio signals, switching phase and ground lifting for use with guitars, basses, keyboard instruments and musical instruments and parts therefor and instructional manuals, sold as a unit

'audio':13,25 'balanc':22 'bass':36 'box':4,8 'buffer':24 'combin':10 'convert':15 'direct':6 'electron':1 'ground':30 'guitar':35 'high':16 'imped':17,21 'instruct':46 'instrument':38,41 'keyboard':37 'lift':31 'line':23 'low':20 'manual':47 'music':40 'part':43 'phase':28 'signal':2,7,14,18,26 'sold':48 'switch':3,12,27 'therefor':44 'unit':51 'use':33

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