Those are some nice projects and I like that you can plug your instruments and microphone directly into the pedal. Now my requirements list for the ultimate controller pedal has grown. ;-)

Start with something like the Behringer FCB1010. Add some programmability and get rid of a few unnecessary cables similar to the mods that are available on http://www.fcb1010.eu. Switch to USB-MIDI and add two TRS combo jacks with so I can plug in my microphone and my guitar. The pedal should double as a audio interface, a MIDI controller, be powered over USB but be capable of powering my tablet over USB when hooked up to 9V.

As I write this I realize that what I'm looking for is pretty much a Guitarjack Stage https://www.sonomawireworks.com/guitarjackstage but with more footswitches, less knobs and two built-in expression pedals.