Check out the M-Audio Keystation Pro. 88 key controller http://www.musiciansfriend.com/srs7/g=home/search/detail/base_pid/709203/.

With 24 assignable buttons and 22 assignable knobs and software to integrate with popular softsynths, I think the day is dawning that you can use softsynths for live play.

I don't know if anyone is using this yet with OMB. I wouldn't venture into using a controller as an arranger keyboard for live play. As a nursing/retirement home performer, I want lightning setup and takedown time.

Beakybird