I am thankful for all suggestions and advice here. This is a fantastic and eager to help community. I love that!
However I should clarify already I know Real Band usefulness, excellent program, I don't have problem with RB since I am learning to use it, besides my brother has know-how of audio recording and computer stuff and assist me in edition and mixing of my songs. We use RB and Sonar for all the details of my done songs in BIAB. I just want to stay in BIAB while I input/change and test chords, different styles and rhythms without losing a single one of the advantages, RB seem not to implement all the BIAB song features since it is more focussed in edition. I think Jim111's suggestion of to use Kontakt or any other multi-timbral sampler is more viable to me. Also John advice on MIDI Ox virtual cable look so interesting. I still waiting for something, a software or universal virtual rack for set my virtual instruments in a simple way.

Thanks to you all wonderful people

*- Ginna -*