All of the apps that claim to support the MCU protocol, only partially do so. If you've ever used a real MCU, you'd be accustom to the multi-button controls. Unfortunately, I've yet to see a soft MCU that allows you to hit EQ+Vpot8 to instanciate and operate the LogicEQ for example.
As has already been mentioned, the TouchOSC control is by far the most complete and easiest to set up. Works a treat!