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OVE III is a formant series synthesizer digitally controlled from a small computer. Like its predecessor OVE II, it comprises three parallel branches for generation of vowels, fricatives, and nasals, respectively. The principles of some key circuits are described. The modular design uses small gains at the critical points to minimize noise and stability problems. The buildup of the complete synthesis instrumentation, including spectrum-matching facilities, is described together with the program system used.