Thanks

I've found most the needed information on the Roland manuals

I was not aware about the OSL project.

Of course vArranger will work well on it, because it is Windows 7 64 bits inside.

I am ok to develop a partnership with the OSL project if there is some need, and create a special vArranger package playing well with the OSL sound set, so the musician just have to plug and play.

I don't think that every OSL owner need an arranger inside.
So maybe we can add it as an option to save money for people who doesn't need it.

Other things you asked will come in future releases of vArranger.