Have you straightened out any of the problems yet? I use the MIDJPRO with the bass pedals and the tonality pedal as I'm a guitar player. I have the AJAMsonic version. I've had problems from the start with it freezing up. When it freezes, none of the buttons on the machine or the touch screen will work. I have to shut it off with the power button and reboot. The last time it froze, even the power button wouldn't work. I had to unplug and replug to reboot. Also, at times I get no volume from the outputs. I have to reboot and replug the cables.
I bought the MIDJPRO because of it's smaller size. But due to it's unreliability, I have to also take my SD3 to a gig as a spare. The idea of this machine is great, If only it worked reliably. I've had many more problems with it as well.