FYI, there is a new "simple" midi controller on the market. Disaster Area DMC-2+ Beyond the ability to do simple program changes, it should also have the ability to send tap tempo and/or expression pedal messages. I don't have proper switch to try the tap tempo functionality, but even if it doesn't work out of the box, the guys at Disaster Area are capable of tinkinering with the firmware to make it compatible with the Hub.
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Nice and they have colour options.