In this version:
# The range of the keyboard was extended to three octaves. You can change the octave by turning the potentiometer around, and the current octave is indicated by the three blue LEDs.
# Three sharp notes, F# G# and A#, were added. I ordered more push buttons, and will add the C# and D# as soon as possible.
# Cleaned up the wiring.
And last but not least, version 3.0 is coming soon! Stay tuned for exciting updates and more awesome projects in the future!