asafar - thanks! Sure the oriental playing will be take in considerations!

Starkeeper - Exactely, the Soudfonts, Vsti, and Vst plugsin effects are in my needs for this arranger!
I finnally understand that it shold be a good idea to make the recognisation customable! I m imagining all combinations possibles for one chord... If someone car help me to enumerate them :
We must do a table with for example the C chords :
Cm : all the kinds : C Eb / C Eb G / Eb G C...
C :
C7 :
CM7
....

First, we need to define all kind of existing type of chord (m, M, 7th...)
and for each all the combination possibles

And after we will do it for all notes (just via transposition, I don't think it's interesting to get the reconngnisation different between notes! what do you think?)

And after we need to see if there is combination in double or triple between different notes, and each one will choose it's version of the thing !

rikkisbears- Of course styles are important ! Since Yamaha styles are in midifile format, and the format is very known, it will be the standard for the Software, but perhaps after, we will make compatible with other Styles format...
But it's a more difficult cause the compagnies never tell us the format specifications, and it need a hacking work to understand all... !But it will be good to have a soundfont package by style manufacturer, for example if you load a Ketron Pattern, it play it with sampled live drums of ketron...

ailev - Of course after the software is finished, it will be very good if we make a very good soundfont with sampled sounds, with sampled loops, not limited in size of memory (why not 1 Gb of samples played directly from hard drive) and very good styles with the ketron type live drums!
It sould be cool if all good members from us add their contributions to make a strong Factory Preset, I will take only the best things, and will compile them for us..
The other arpeggios things I will see them later.

The future is computers !