Multiple key electronic instrument having background songs each associated with solo parts which are synchronized with and harmonious with the background song
Patent 5074182 Issued on December 24, 1991. Estimated Expiration Date: 
January 23, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
January 23, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesEntertainment and creative expression device for easily playing along to background music Constantly changing polyphonic pitch controller Patent #: 4794838 InventorsAssigneeApplicationNo. 469095 filed on 01/23/1990US Classes:84/609, Note sequence84/600Electrical musical tone generationExaminersPrimary: Shoop, William M. Jr.Assistant: Kim, Helen Attorney, Agent or FirmInternational ClassG10M 007/00AbstractAn electronic instrument and method includes manual control switches for producing and controlling creative variations on pre-recorded song selections that remain synchronized and melodiously oriented to the selected song substantially independent of the timing of manual operation of control switches. Several instruments of similar design can be connected together to facilitate `playing in a band` of such instruments which synchronize on the song selected via one instrument and which respond to individual solos or riffs `played` on one instrument with corresponding, timed solo or riff capabilities on other instruments.Other References
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