Social science You can change it in 3 minutes a day! Getting a Successful Voice Book / yumiko Nakajima

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Social science
What is the "waveform of voices" common to people who have good sales performance, people who are moved by presentations and speeches, and people who improve human relations? Work and life will go well with "voice diagnosis" ヴォイトレ which "visualizes" the change of one's own voice! Sales increased about 1000 times just by changing "voice"! There is no abuse of authority! There are many surprising voices from practitioners! This is a book that introduces the epoch-making 3-minute voice training method. [Includes voice diagnosis software and 3-minute training sound source]