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| US3935781 | 30 Jul 1974 | 3 Feb 1976 | Nippon Gakki Seizo Kabushiki Kaisha | Voice presetting system in electronic musical instruments |
| US3972259 | 26 Sep 1974 | 3 Aug 1976 | Nippon Gakki Seizo Kabushiki Kaisha | Production of pulse width modulation tonal effects in a computor organ |
| US4000675 | 21 Nov 1975 | 4 Jan 1977 | Nippon Gakki Seizo Kabushiki Kaisha | Electronic musical instrument |
| US4014238 | 23 Jun 1975 | 29 Mar 1977 | C.G. Conn, Ltd. | Tone signal waveform control network for musical instrument keying system |
| US4026179 | 22 Sep 1975 | 31 May 1977 | Nippon Gakki Seizo Kabushiki Kaisha | Electronic musical instrument |
| US4033219 | 27 Feb 1975 | 5 Jul 1977 | Nippon Gakki Seizo Kabushiki Kaisha | Touch responsive control system for a keyboard electronic musical instrument |
| US4036096 | 10 Jul 1975 | 19 Jul 1977 | Nippon Gakki Seizo Kabushiki Kaisha | Musical tone waveshape generator |
| US4059040 | 10 Sep 1975 | 22 Nov 1977 | Kabushiki Kaisha Kawai Gakki Seisakusho | Tone-source apparatus for electronic musical instrument |
| US4067253 | 2 Apr 1976 | 10 Jan 1978 | The Wurlitzer Company | Electronic tone-generating system |
| US4114496 | 10 Jan 1977 | 19 Sep 1978 | Kawai Musical Instrument Mfg. Co., Ltd. | Note frequency generator for a polyphonic tone synthesizer |
| US4132140 | 18 Oct 1977 | 2 Jan 1979 | Nippon Gakki Seizo Kabushiki Kaisha | Electronic musical instrument by digitally calculating harmonics and coefficients |
| US4133241 | 25 May 1976 | 9 Jan 1979 | Nippon Gakki Seizo Kabushiki Kaisha | Electronic musical instrument utilizing recursive algorithm |
| US4133242 | 2 Mar 1977 | 9 Jan 1979 | Nippon Gakki Seizo Kabushiki Kaisha | Waveshape memory type electronic musical instrument |
| US4149440 | 14 Mar 1977 | 17 Apr 1979 | | Polyphonic computer organ |
| US4184402 | 23 Dec 1977 | 22 Jan 1980 | Kabushiki Kaisha Kawai Gakki Seisakusho | Electronic musical instrument |
| US4201105 | 1 May 1978 | 6 May 1980 | Bell Telephone Laboratories, Incorporated | Real time digital sound synthesizer |
| US4202234 | 27 Apr 1977 | 13 May 1980 | National Research Development Corporation | Digital generator for musical notes |
| US4238984 | 20 Dec 1977 | 16 Dec 1980 | Kabushiki Kaisha Kawai Gakki Seisakusho | Electronic musical instrument |
| US4244257 | 26 Mar 1979 | 13 Jan 1981 | Nippon Gakki Seizo Kabushiki Kaisha | Wave-shape generator for electronic musical instruments |
| US4306482 | 23 Jan 1980 | 22 Dec 1981 | Casio Computer Co., Ltd. | System for generating sample tones on an electronic musical instrument |
| US4387619 | 13 Aug 1981 | 14 Jun 1983 | Casio Computer Co., Ltd. | System for generating sample tones on an electronic musical instrument |
| US4409877 | 14 Jul 1981 | 18 Oct 1983 | CBS, Inc. | Electronic tone generating system |
| US4646612 | 23 Jul 1985 | 3 Mar 1987 | Nippon Gakki Seizo Kabushiki Kaisha | Musical tone signal generating apparatus employing sampling of harmonic coefficients |
| US5009143 | 26 Dec 1989 | 23 Apr 1991 | | Eigenvector synthesizer |
| US5074183 | 29 Sep 1989 | 24 Dec 1991 | Yamaha Corporation | Musical-tone-signal-generating apparatus having mixed tone color designation states |
| US5814751 | 1 Nov 1995 | 29 Sep 1998 | Seikosha Co., Ltd. | Musical tone generating apparatus |
