electronically, optically and/or magnetically pre-recorded musical data on compact disks, cassette tapes and/or microchips for use in player pianos; player piano conversion kits comprising mechanical units for operating and/or being operated by the piano keys and electronic controllers for converting pianos into player pianos; musical data readers and recorders for operating and/or recording the operation of player pianos and digitally operated musical instruments; and analog-to-digital and digital-to-analog interfacing units for converting musical signals in the operation of player pianos and other digitally operated musical instruments

'analog':68,75 'analog-to-digit':67 'and/or':3,15,31,54 'cassett':13 'compact':11 'compris':26 'control':40 'convers':24 'convert':42,79 'data':9,48 'digit':62,70,73,90 'digital-to-analog':72 'disk':12 'electron':1,39 'instrument':65,93 'interfac':76 'key':37 'kit':25 'magnet':4 'mechan':27 'microchip':16 'music':8,47,64,80,92 'oper':30,33,53,57,63,84,91 'optic':2 'piano':21,23,36,43,46,60,87 'player':20,22,45,59,86 'pre':6 'pre-record':5 'reader':49 'record':7,51,55 'signal':81 'tape':14 'unit':28,77 'use':18

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