The Mellotron Group

Looks like he is playing a Misa Kitara midi controller / Status Bass hybrid.

Muse - Madness
http://www.youtube.com/watch?v=_Zo8g6NWRow

http://www.misadigital.com/kitara.html

http://www.youtube.com/watch?v=IE6d9XtLluo&list=PL19319C10F94E4563&index=1&feature=plpp_video