Hey, I've just built a musical arduino sphere. I wonder if we could dock a few cubes onto it like a mother-ship?
www.kickstarter.com/projects/1873232700/dub-cadet-next-level-musical-fun-for-everyone
Your audiocubes could add in MIDI based effects, loops, and filter envelopes; I don't know the sky is the limit. There is so much creativity going on around here 
i checked out your site and it seems we have a common goal. "Enable social interaction, music, sound and visual creation and play"
That's what the Dub Cadet is all about!
peace,
-Noah