All New 32-bit Program Engine - Previous versions of Band-in-a-Box were a combination of 16-bit and 32-bit code. The new program is rebuilt with a 32-bit-clean engine. Program operations are much faster, including up to 3 times faster notation redraws, song and soloing generation. Playback timing is improved and rock-solid with all versions of Windows, including the newest XP and Media Center operating systems. The GUI is enhanced with floating/ dockable toolbars.
The Harmony track names written to the MIDI file are now more descriptive, including an 8va/8vb setting.
Option to Auto-Open Big Lyrics or LyricView Window if song has lyrics, and close it if no lyrics present.
StylePicker Dialog “show all” button added which removes any filter set. 
Chords like C7+ can be typed without using the shift key, the program automatically converts the “=” symbol to the + key. 
StyleMaker “mute a pattern” option added (press M to mute a pattern or select Pattern-Mute from the menu).
...and many more!

 
Til dansk beskrivelse af grundfunktionerne i Band-in-a-Box.