Page 357 - ProShow Producer 9 Final Manual
        P. 357
     356     12. Music and Sound Effects
            8.   Next, press the CTRL key, click on the second track and drag it to
               the left.    This sets the Offset for the second track to a negative
               value. This means the second track will now start before the first
               track ends.
            9.   Release the CTRL key when you have the tracks crossfaded to
               your liking.
        In the Timeline you’ll notice that the waveforms have come together to
        create a teal color (the blending of green and blue) to visually let you know
        that the tracks now crossfade.
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