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In this paper we present an original research work culminating in the high quality production of thirty-nine minutes of castrato voice, by the means of sound analysis, processing and synthesis. The goal of the project is the creation of a soundtrack for a film about a famous eighteenth century castrato. Two complementary voices - a coloratura-soprano and a counter-tenor - are used to cover the entire range and compensate for technical difficulties. Then their timbres are homogenised by using combined techniques such as phase-vocoding, additive analysis/synthesis and spectral envelope and pitch estimation.