English: Version E Voice Module boards that are contained in a Roland Jupiter 4 for Serial Numbers XX4100 and above, refer to diagram, page 30 of the Service Notes, 2nd Ed., Feb 23, 1981. Revision E voice boards were the last version made and use the Roland IR3109 filter IC and can be identified by the one extra trim potentiometer.
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{Roland Service Notes, 2nd Edition, Feb. 23, 1981}
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