Above the treble staff, towards the left, look for a couple buttons that look like tictaktoe boards. The third button in this group turns on "staff roll mode." Here each note has 2 blue lines coming from it. The vertical line is velocity, or loudness. The horizontal line is duration. You can change these lines and their associated values by making the blue lines longer and shorter. Use the right mouse button to do this. The right mouse button.

This is a lesser know feature of BiaB, and it is brilliant. Manipulating the horizontal line will give you as fine a degree of control over the legato values of the melody notes as you could ever want.

Flatfoot sez: Call me when 'Talent-in-a-Box' is ready to ship! -- [8{>

Got some tunes on You Tube:
http://www.youtube.com/user/flatfoot50
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My BiaB lesson site:
http://jdwolfe0.wixsite.com/learnbiab