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I often find that the HARMONY feature gives the sound I want for melodies.

At the next-to-the-top line of the main screen, go to HARMONY, then MELODY HARMONY. Try a few of the harmonies in the menu to see what's going on. Try #5 PIANO DOUBLE OCTAVES, especially.
That is my starting point.

The harmony I use most often is a piano (from sample tank) with a unison piano one octave higher and another one octave lower. The upper and lower octaves are a lot quieter than the main voice.
I find this makes the overall piano sound complex, thick and believable.

I create this and save it as harmony #6. There is a learning curve to mastery of the harmony tool, but it is worth it. The harmony you create will work with any synth you choose.

NOTE: The harmonies you create will be erased every time you upgrade BiaB. The solution to this is to save C:/BB/DEFAULT.HAR as C:/BB/YOURNAME.HAR. Then you can restore your file after each upgrade.

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