There is a video of a MIDI-operated accordion built by a person
identified only as GPTO at this French website: 

    http://www.dailymotion.com/video/xbagzs_accordeon-automatique_music 

At first glance he seems to be playing it, but he isn't.  He merely
supplies the wind.

Here are photos of its construction:

    http://gpto6.blog4ever.com/blog/photos-cat-330785-1948552289-accordeon_midi.html  

And here more information about GPTO's creations:

    http://www.dailymotion.com/GPTO1/1 

Enjoy,
Philippe Cichon