switching plugins with a foot controller

[nico spahni <nicosp@gmx.net>]

I'm looking for a midi foot controller to control plugins (Mac OSX 
Audio Units) in live performances. I'll mainly need to switch the 
plugins on/off (bypass function), one or two real time controllers 
(expression pedals) would be handy, too. Does anyone need foot 
controllers for similar purposes? What type of controller should I look 
for?

Best

Nico