DIY midi keyboard with patchblock

Homemade MIDI keyboard using PIC 16F1788 attached to patchblock (http://patchblocks.com). Keyboard is powered from patchblock battery. Update: Added octave switching between 3 octaves with the red key. Blue and yellow keys still unused. Software is around 100 lines of code. Hex file for the program is here: https://www.dropbox.com/s/laafeo61ehqoog0/PIC16F1788_MidiKeyboard.X.production.hex?dl=0