http://www.roland-arranger.com/smf/index.php

Make this your first stop shop, Zuki.

Probably, most of your questions have been answered already, here, and we have a good search engine. A good, mostly no-nonsense ( ) site, with plenty of solid info...

Come on in, the water's lovely!
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An arranger is just a tool. What matters is what you build with it..!