| 984 / | HD | MUSICAL INSTRUMENTS |
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| 300 | DD | ELECTRONIC MUSICAL INSTRUMENTS {structural combinations of microphones, pick-ups, or amplifiers with musical instruments subclasses 1+, 50+, and 100+; Instruments in which each note is generated by a different individually-actuated mechanical resonating structure and is amplified electrically subclasses 50+; Instruments in which each note is produced by a different electrically-vibrated sounding element subclasses 100+; Electronic circuits in general H03. {G10H} {4} |
| 301 | DD | .~ Details of electrophonic musical instruments {keyboards applicable also to other musical instruments subclasses 1+ and 50+} {G10H 1/00} {9} |
| 309 | DD | .~.~ Means for controlling the tone frequencies, e.g., attack, decay, etc.; Means for producing special musical effects, e.g., vibrato, glissado {for instruments using voltage controlled oscillators and amplifiers or voltage controlled oscillations and filters, etc., see subclass 381} {G10H 1/02} {2} |
| 310 | DD | .~.~.~ By additional modulation {G10H 1/04} {2} |
| 314 | DD | .~.~.~.~ During execution only {voice controlled instruments subclass 388} {G10H 1/053} {3} |
| 316 |  | .~.~.~.~.~ By switches with variable impedance elements {G10H 1/055} {5} |
| 317 | DD | .~.~.~.~.~.~> Using variable capacitors {G10H 1/055C} |
| 318 | DD | .~.~.~.~.~.~> Using optical or light-responsive means {G10H 1/055L} |
| 319 | DD | .~.~.~.~.~.~> Using magnetic or electromagnetic means {G10H 1/055M} |
| 320 | DD | .~.~.~.~.~.~> Using piezo-electric means {G10H 1/055P} |
| 321 | DD | .~.~.~.~.~.~> Using variable resistors {G10H 1/055R} |