First of all, thank you all for keep sending me messages
To the point: I tried 3 times to build this controller. It is nearly impossible to get a reasonable selling price (i.e < US$ 500) without a established hardware company backing you.
In the last months I received a couple of emails from very nice people around the globe (Thanks Emre - from germany )
So I decided once more to try to build this thing.
I will keep you posted here and at the website of my musical group, storya.
STORYA
Best regards
Paulo