http://musicdevelopments.com/shop.html

You can try the demo first.
http://musicdevelopments.com/demo.html

All our software 40% off until April 20!

RapidComposer v4 (music prototyping): $199 $119
RapidComposer v4 LE (music prototyping): $79 $47
Melodya (motive generator and editor plug-in): $49 $29
MIDI Mutator (MIDI file processor plug-in): $49 $29
Syne (modular additive synth plug-in): $89 $53

RapidComposer full edition orders receive free Melodya and MIDI Mutator licenses (by request).

RapidComposer VST/Standalone you can open Yamaha Styles save them to the library (rename to.mid).
Run the VST inside Biab.
Drag the chord track from Biab into RapidComposer Midi Import to give the same chords. I think they were planing on implementing it to just work with Yamaha styles.
You can drag midi style tracks from Biab into RapidComposer and save them to the library.
You can Drag midi phrases from the internet and save to library.
You can drag midi loops from EZKey, EZDrummer and EZBass and save to library.
It will fit any phrase/loop/track/stem to any progression, it will handle more chords/any chords than Biab or EZKeys.