Why not Pure Data? Writing mappings is easy and can be routed to osc or
Midi plus it can talk to Arduino.
Cheers,
Malte
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media art + development
http://www.block4.com
current exhibition: Einstellungsraum Hamburg 5.-27. November 2009
new software released: contrOSC, control your Mackie C4 with OSC
http://controsc.sourceforge.net