Does anybody can help here? I dont speak english very well so I'm not shure I well understand what is his problem.
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ctrl-t command will open the Tempo Track window. When the "master" is activated, the tempo of the song is guided by the Temo Track information. if the "master" is not selected, you can simply write the tempo you want, just over the "master" button.
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I dont understand what your trying to explain when you say that, in winamp, and in cubase, the song has the same length. If it has the same lenght, then, how could the tempo be slower???