Stm32f4 usb midi synthesizer with 61 keys movable octave,

press keys_0 for change mode {single, split, quad}

• Single mode = full 61 keys
• Split mode = 61/2 keys
• Quad mode = 61/4 keys

Todo / Next:

• set velocity with double button for each teeth
• set mod x and y
• pedals
• light or rgb maybe?
• another button for configuration
• lcd