Keywords: Jupiter-4 voice cards.jpg en 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 2014-01-14 14 30 30 Roland Service Notes 2nd Edition Feb 23 1981 cc-zero Uploaded with UploadWizard Digital controllers on analog synthesizers 1978 introductions Roland Jupiter-4 |