Design Diagram

Modular MIDI Controller Process Model:

A case like this by SunFounder would allow for access to all the necessray ports while still protecting the Arduino. However, the connections would not be the most secured as pins have the potential to fall out of their connection. A separate solution must be considered for the power method of batteries such as pictured above, by TinySine, to make sure that the batteries can be attached to the case while still providing safety to the user and to the device.