Hello, Pradon, Rebecca0630 and Icelander,
Thank you very much for your warm comments.

Rebecca0630,
I’m a user of Band In A Box Macintosh version.
BIAB Mac ver. cannot work directly with Vocaloid.
There may be a couple of ways to let Vocaloid sing with tracks generated by BIAB.

My method is as follows.
I have used Cubase as a DAW application for years.
And I have been using “VOCALOID Editor for Cubase” to let Vocaloid sing.
“VOCALOID Editor for Cubase” is a vst plug-in application
If a Band-in-a-Box (MIDI) style have been chosen, convert the songs generated to a standard MIDI file first.
If a Real Track style chosen, convert the song to audio (WAV) file.
Read those files into Cubase and input melody notes and lyrics to “VOCALOID Editor for Cubase”
And you can make a vocaloid song.
Sorry, I can’t describe the entire method well with my poor English.
Details can be found at following link.

http://www.vocaloid.com/en/lineup/vocaloid4/v4editor.html

Icelander,
I know Giorgio Moroder, because "Never Ending Story" was a big hit also in Japan.

Than you,
Shigeki Adachi