US PATENT SUBCLASS 984 / 308
.~.~ Means for obtaining special acoustic effects {combined with modulation subclasses 311+} {G10H 1/00S}


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984 /   HD   MUSICAL INSTRUMENTS

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}
308.~.~ Means for obtaining special acoustic effects {combined with modulation subclasses 311+} {G10H 1/00S}