New board is already on the way from OSH Park.

Changes include:

• MIDI via uart0 instead of SoftwareSerial (which was causing crashes)
• Debug logs via uart1 and some new extra debug macros
• Midi Through output
• Board will now be mounted upside down on the top side of enclosure. This will enable adding PCB mount buttons + screen on the same board (bottom side) in future revisions

Even before the new boards arrive I realized that rubbish bytes sent by ESP8266 core during startup will cause trouble. Something to be fixed in next revision.